AITA for wanting to tell my stepdaughter that her dad installed a tracking device in the new car he bought for her 18th birthday?

Imagine a heartfelt 18th birthday gift—a shiny new car—tainted by a hidden secret that could shatter trust. For one stepmom, the joy of her stepdaughter’s milestone is overshadowed by her husband’s decision to install a tracking device, sparking a moral tug-of-war. Torn between loyalty to her husband and protecting the girl who calls her a second mom, she’s ready to spill the truth, risking family peace.

This emotional tale dives into the complexities of step-parenting and control. Is she wrong to intervene, or is her instinct to protect spot-on? Let’s explore the story, hear Reddit’s take, and get an expert’s view on this trust-testing twist.

‘AITA for wanting to tell my stepdaughter that her dad installed a tracking device in the new car he bought for her 18th birthday?’

I f36 have been married to my husband for 3 years. He has one daughter 'Christine' , she'll soon be 18 years old and he's bought her a new car as her birthday gift. Here's the thing. Christine's mom is deceased. She has a good relationship with me. In fact, not too long ago she told me I was like a second mom to her.

This of course means everything to me. However, She and her dad don't get along that much. I havd to say that's he's incredibly overprotective of her but has done things that affected their relationship. Like how he caused her to break up with her ex boyfriend after he got diagnosed with a multiple health conditions.

Because of that, Christine has grown distant from her dad. For her 18th birthday he wanted to throw her a big celebration and buy her the car she always wanted as a way to reconcile with her. They're on ok terms now but he says he wants to gain back her trust.

2 days ago, I overheard him speaking with a friend of his about installing a tracking device in the new car. I was stunned. I brought up with him later at night and told him how wrong this was. He said it was non of mu business but I told him that if and when Christind finds out then there's gonna be troubles.

He got upset and went on about how he's just doing this out of concern and protection gor her and said it was non of my business whatsoever since I didn't buy the car. I called him unreasonable and said that if he don't back off then I'll tell her at the party and when be hands her the key.

He was shocked at this, he called me crazy and said that I shouldn't have been snooping and listening to his private talks in the first place. I said I'd tell her but he told me to stay out of it since it's *his daughter* not mine and that if I wanted to parent *my way* then I was free to have my own children.

This stung because he knows I can't have kids due to infertility problems. We argued about it and I said I'd still tell her. He called me unhinged and said I get no say nor do I have the right to get involved whatsoever. Just stay of it he kept repeating.

I consulted my mom and she agreed it was non of my business. She told me to stay out of it and not try to stir drama and cause scenes. She said I should know better and stay on my husband's side since stepkids are always flippant. I'm torn on this but I'm still insisting on it.. AITA?

This family trust dilemma hinges on boundaries and transparency. The 36-year-old stepmom, cherished as a second mom by her stepdaughter, faces a husband whose overprotective streak—culminating in a secret tracking device—threatens their fragile reconciliation. His dismissal, especially the infertility jab, deepens the rift, pushing her to act.

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Research highlights the impact of surveillance on relationships. A 2023 study in Journal of Family Studies shows that hidden tracking erodes trust, particularly with emerging adults like an 18-year-old, who deserve autonomy. The husband’s “concern” masks control, while the stepmom’s urge to disclose aligns with fostering honesty.

Dr. Harriet Lerner, a family therapist, notes, “Secrets in families breed mistrust; truth, even when hard, builds bridges.” The stepmom’s instinct to tell Christine is valid, though timing—perhaps privately, not at the party—could soften the blow. The husband’s cruelty suggests deeper issues, warranting a serious talk or support.

Here’s how people reacted to the post:

The Reddit community rallied with fierce support, raising red flags about control and privacy. Here’s what they had to say:

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Britsgirl30 - NTA CHECK YOUR CAR AND DEVICES FOR TRACKERS/SPYWARE!. If he’s doing it to her on the sly he may have/ probably has done the same to you.. It’s insanely creepy, violating and even more concerning is his ‘keep your mouth shut’ type reaction.

Don’t walk. Run. Preferably leave before telling your step daughter everything (don’t do it at the party) and making sure she knows you’re there for her.. ETA he actually brought up your infertility issues to win this ‘argument’?!. RUN!!!

sysadrift - NTA. Have you checked *your* car for tracking devices? If he’s willing to do it to his daughter, he’s willing to do it to you too. Also, check your phone for any apps you don’t recognize.

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Mercury5979 - NTA - '...and said I shouldn't have been snooping and listening to his private talks...' Said the man to you who just installed a tracking device on his 18 year old's car.. She is legally an adult and should not be tracked without her knowledge.

Basic-Elderberry-744 - If he is willing to hide a tracking device and justify it as “protectiveness* over his daughter… what tracking devices and/or recording devices does he have on you? Draw a hard boundary. He is purposefully violating his own daughters privacy (in a very illegal way)

and trying to gaslight the situation to make you seem like the bad one *for finding out his terrible action/crime*. I would reconsider my marriage to a man like this and also do a sweep of my own things to ensure he hasn’t been tracking or recording me against my will without my knowledge.

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[Reddit User] - NTA. Anyone trying to present this to you as a father-daughter conflict is off-base here. This is a man who is doubling down on his loss of control over a grown woman fed up with not being able to make her own choices

by making it clear he will *never* allow her to live her life without his approval. What would you do if Christine were a friend in a relationship with a man like this, and not your stepdaughter? What would you want her to do for you?

MoonGladeLadyBug - She sees you as a 2nd mother. Be that for her and tell her. Please don’t let her be taken advantage of by her controlling and abusive father.. NTA

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teh_stev3 - NTA and also red flags. He's controlling you and your step-daughter, trying to keep tabs on her and trying to discredit you by calling you 'unhinged'.. Sure, he can put a tracking device in, but she deserves to know.

genus-corvidae - TELL HER. Ask her to not tell him that you told her if you like, but TELL HER THERE IS A TRACKING DEVICE IN HER CAR. She deserves to know and not be constantly tracked, and also to know that this wasn't a real effort at reconciliation but just another way for her father to control her.. Also:

he told me to stay out of it since it's his daughter not mine and that if I wanted to parent my way then I was free to have my own children. This stung because he knows I can't have kids due to infertility problems.. He's cruel to *you*, as well as being a controlling a**hole to his daughter. You *also* deserve better, OP.. NTA.

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ddl_smurf - NTA - by the way how sure are you that you're not tracked too ?

Help24-7 - NTA. You need to tell her.....Also depending on where you live that is illegal and you could face criminal charge. Is she moving out soon?? Going away to college?? Or has plans to do other things since she will be 18??.

He wants to keep his control over her.... Not rebuild his trust with her.. Also if he's willingly to do that to her--what has he done to you??. Buy her a scanner or jammer for her birthday gift from you.. And keep a good divorce attorney on retainer......You deserve better OP.....

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These passionate Reddit takes urge her to tell Christine, warning of the husband’s potential overreach into her life too. Is this a step toward freedom, or a family fracture? The consensus backs her protective move.

This car-key conundrum shows that trust trumps control every time. The stepmom’s resolve to reveal the tracking device honors her bond with Christine, while her husband’s secrecy needs a hard look. A private chat might mend ties without drama. Have you ever faced a family secret that demanded action? What would you do to balance love and honesty here? Share your thoughts below!

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