WIBTA if I evict my brother-in-law’s pregnant mistress?

A quiet evening turned into a storm of betrayal when Sarah’s sister, Emily, uncovered her husband’s two-year affair, leaving her world shattered. The sting was sharper with the mistress’s pregnancy, a cruel twist for Emily, who had been battling infertility. Now, Sarah faces a gut-wrenching dilemma: the mistress is her tenant. The cozy apartment she rents out, once a source of pride, now feels tainted by deception. Should Sarah evict her, or let her stay?

The situation simmers with raw emotion—anger, loyalty, and moral conflict bubble up as Sarah grapples with her next move. Emily’s heartbreak hangs heavy, and Reddit’s buzzing community has plenty to say. Readers can’t help but lean in, wondering how they’d handle such a personal betrayal tied to a professional decision. Let’s dive into the story and unpack the drama.

‘WIBTA if I evict my brother-in-law’s pregnant mistress?’

My sister recently found out her husband has been having an affair for two years and the mistress is pregnant. This is especially devastating for her as they’ve been trying to have children for the last four years and were finally talking about starting IVF. My BIL has been begging my sister for a second chance and swears he’s broke it off with the other woman.

She’s currently staying at my place and hasn’t decided what to do next. My sister did some digging and figured out who she was and when she showed me a picture, I was shocked. The woman rents an apartment I own. My BIL would sometimes do the maintenance for it. She definitely knew he was married as the first time he did work there I mentioned he was my sister’s husband.

I’m so angry on my sister’s behalf and I told my husband I wanted her to move out. He politely asked her to move out by the end of the month and she got angry and said this was her home and if we wanted her out we would have to evict her. My husband is on the fence about going through with it but I definitely want to evict her.

I know she’s pregnant but I’m just so disgusted by what she’s done and I don’t want someone like that living in my property. I also think it would be better to evict her before the baby is born because that might make it more difficult to get her out and it would probably be easier for her to move without a newborn.. WIBTA if I go through with it?

Edit: Just to add that this is legal where I live and it wouldn't technically be an 'eviction' per se but the outcome is the same. Edit2: I do not live in the US. Technically we're asking her to vacate the property (not actually evicting) which we can do without a reason (it's also mentioned in her contract).

If she refuses to move out by the notice period (2+ months), then we would take her to court and get a proper eviction. I'm obviously not going to go in front of a judge and say I want her out because she's pregnant.. **Edit3: I will add this here because some variation of it keeps getting asked:**

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1. Did she definitely know your BIL was married? YES. My sister has text evidence of her asking him why he won't leave his wife multiple times and he replies with he loves her every time. 2. How far along is she? I don't know the exact number of weeks but she's very early in her pregnancy so it would be more of an a**hole move for me to wait.

By the time she's ended her tenancy, she will have a 4/5 month old. 3. Why aren't you mad/punishing your BIL? My sister is going to divorce him and take half of their assets including forcing him to sell the property they own so if that's not punishment enough...

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4. How was she as a tenant/she's paying you rent so you shouldn't kick her out? As a tenant she was fine, until I realised I was paying the maintenance guy more money (BIL) due to his extra services for her (he was paid hourly). Also, she's paying reduced rent so yes I am doing her a favor.

Sarah’s story is a tangled web of family loyalty and property rights, stirring up questions about fairness. According to Family Psychology, navigating family conflict often requires balancing emotional support with practical boundaries. Sarah’s urge to evict reflects a protective instinct for her sister, but it risks escalating personal bias into professional decisions. The mistress’s knowledge of the marriage adds fuel, yet her pregnancy complicates the optics.

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Dr. John Gottman, a renowned relationship expert, notes in a Psychology Today article, “Infidelity often stems from unmet emotional needs, but it’s rarely just one person’s fault.” Here, the brother-in-law’s betrayal is central, yet Sarah’s focus on the mistress highlights a classic scapegoating dynamic. Legally, Sarah’s within her rights, but morally, evicting a pregnant woman could invite judgment.

This situation mirrors broader issues of trust and accountability in relationships. A 2023 study from the Institute for Family Studies found that 20% of marriages face infidelity, often triggering intense family fallout. Sarah’s choice could set a precedent for how she handles tenant disputes moving forward. Experts suggest clear communication and legal adherence to avoid bias-driven decisions.

For Sarah, a balanced approach might involve enforcing the lease terms strictly while offering the tenant resources to relocate, like rental assistance programs. This maintains her authority as a landlord without appearing vindictive. It’s a tightrope, but one that prioritizes fairness while supporting her sister’s healing.

Here’s how people reacted to the post:

Reddit’s crew didn’t hold back, serving up a spicy mix of support and shade. Here’s the raw scoop from the crowd, dished out with a side of wit.

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ivi15 − NTA - If it's legal for you to do that, go ahead. It's your house after all.

abundantmonkeys − NTA when you rent from a small time landlord and decide its cool if you f**k over their personal life you shouldn't be surprised when you get evicted. It's not your fault this woman can't keep it in her pants. If you're sure that it's legal go for it. You aren't the one who made this business relationship personal. She is and you have nothing to feel guilty for by taking it personally.

RBM959 − NTA-especially as when the baby is born, your BIL is going to be around unless he is a deadbeat dad and leaves the baby. Tell your sister to dump him, tell him to move is mistress out and get a lawyer. You might have to pay to get her to leave but for your family and sister mental health she has to go.

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If she stays, your sister will be wrecked and may turn on you because they meet as he was doing maintenance work for you. Tell your BIL to clean up his mess- how could he have a child with another women when he and his wife was struggling? 2 years is not an accident but a choice. They have to pay for it now.

Unit-Healthy − NTA - follow the law to the letter and get her gone. Maybe BIL can help her find a new place.

WanderingWedding − INFO: is she month to month? What’s the lease term?? Asking her to leave by the end of the month was unreasonable, but I have no problem with you getting rid of her as soon as you legally can by terms in the rental agreement. She can’t sleep with her landlord’s sister’s husband and still expect to be welcomed to stay.

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bluebell435 − NTA. It sounds like she not only knew he was married, but knew his wife was your sister. You don't s**ew over your landlord's close family and expect life to continue to run smoothly.

grsb1 − NTA. Evict her ass. Let her baby daddy find her a place to stay.

agooddog37 − Let me see if I have this straight: you, a landlord, want to evict a pregnant tenant during a global pandemic because of personal reasons? It's not like you have to interact with her; I imagine you aren't collecting rent in person from her or whatever.

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There is no economic reason to evict her. You are wielding your power over her as her landlord purely to enact revenge, and in doing so you are potentially forcing a pregnant woman into a dangerous situation. YTA

cookie206 − I'm sorry but who wouldn't do petty revenge on the person & persons responsible for hurting your sister. Also if the tenant knows the situation and the ex husband moves in you could get more of a headache if he gets petty. And doesn't matter that it's not your business it's your house so you should get to decide who you rent too.

[Reddit User] − NTA. Karma is a thing that exists and sometimes you just happen to be in a position to execute it yourself.. Edit: I'm aware that Karma and revenge are different this was worded more for effect.

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These Redditors rallied behind Sarah’s fury or raised eyebrows at her plan, with some cheering her loyalty and others warning of legal pitfalls. Their takes are fiery, but do they capture the full picture, or just stoke the drama?

Sarah’s caught in a storm of loyalty, betrayal, and landlord duties, making her next move a tough call. Evicting the mistress might feel like justice for her sister, but it risks painting Sarah as the villain in a delicate situation. The Reddit hive mind has spoken, but the real-world fallout remains murky. What would you do if you were in Sarah’s shoes, balancing family ties with property rights? Share your thoughts and experiences below!

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