AITA for not giving my sister my SIN number when she said the CRA will arrest her?

What would you do if a family member demanded sensitive personal information, claiming it’s a matter of avoiding jail? A 17-year-old faced this unsettling situation when her older sister insisted on getting her Social Insurance Number (SIN) for alleged tax issues. The request raised red flags, especially given the sister’s secretive relationship and shifting explanations.

The teen’s instincts screamed scam, backed by advice from her mom and friends. Social media users echoed her concerns, warning of fraud and urging caution. This story highlights the challenge of balancing family loyalty with self-protection when trust feels shaky.

‘AITA for not giving my sister my SIN number when she said the CRA will arrest her?’

The story starts with the teen’s relationship with her sister and her sister’s secretive boyfriend.

I 17f have a sister 27f who has a bf (61m) and she doesn't know I know about him. He's basically her sugar daddy and I don't mind because she...

She stopped talking to my mom after my mom told her to break up with her bf, and the only reason she still talks to me is because she thinks...

The conflict emerges when the sister demands sensitive personal information.

Yesterday my sister texted me saying she needs my SIN number and my dead dad's SIN number for her 'finances'. I told my mom and a few friends about this...

I got scared so I told her that my mom keeps my SIN number and told her to ask my mom for it. I knew she wouldn't talk to my...

The sister’s persistence and changing stories heighten the teen’s concerns about fraud.

I was so wrong. The next few hours she kept texting me telling me to look for the SIN card. I told her that she doesn't need my SIN for...

and I searched it up and it said that you only need the SIN number when you make the account, not when you do your taxes. So I definitely think...

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The teen faces pressure but refuses to comply, fearing legal consequences for herself.

But she told me that the CRA is going to 'put her in jail' if I don't get the SIN number to her by today. I don't feel comfortable giving...

The core issue is a teen’s refusal to share her Social Insurance Number (SIN) with her sister, who claims it’s needed to avoid jail time. The sister’s high-pressure tactics and inconsistent explanations triggered distrust, especially given her request for their deceased father’s SIN. The teen’s fear of fraud reflects a protective instinct, while the sister’s behavior suggests desperation or manipulation.

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The teen’s caution stems from a need for self-preservation, heightened by her sister’s secrecy about her relationship. The sister’s insistence, coupled with dubious claims about the CRA, indicates possible deceit or influence from her boyfriend. Communication broke down when the sister used fear instead of transparency, alienating the teen.

Psychologist Dr. Lindsay Gibson notes, “Healthy boundaries protect your identity and safety, especially when trust is uncertain” (Adult Children of Emotionally Immature Parents, 2015). The teen’s refusal aligns with this, prioritizing her security over unverified claims.

The teen should verify any CRA requests directly by calling the agency using official contact information. She could also discuss concerns with her mother to set firm boundaries with her sister. Checking her credit report regularly can prevent potential fraud.

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Here’s what the community had to contribute:

Social media erupted with warnings about the sister’s request, splitting into three groups: those labeling it a clear scam, those offering practical advice to verify with the CRA, and a few speculating on the sister’s motives or relationship dynamics.Most commenters urged the teen to protect her SIN, citing obvious scam red flags.

KronkLaSworda − "she needs my SIN number and my dead dad's SIN number" It's a scam. The fact that the story is changing AND that she's using high-pressure, this is...

NTA to say no. In fact, it's time to block her for a while. Block her from your phone, your emails, and everything else.

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COLGkenny − NTA DO NOT DO IT. It sounds like scam, acts like a scam, walks like a scam, it is a scam.

Dear-Midnight − This is a scam. Do not do it. The texts may not even be from your sister. But even if they are, don't do it.

WholeAd2742 − Absolutely NTA She's trying to scam or use your info for fraud If she keeps up, may need to contact law enforcement

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CorporateSharkbait − This is a scam. Likely her bf’s money came from scams if she is now involved in this. You only ever use your personal identity number in specific...

A tax filer will never ask for the full, maybe only the last few digits. They also do not handle sending people to jail, they can report the tax fraud,...

Initial728 − NTA, don't do it! ! This is a scam, typical high-pressure-threatening-jail stuff. I don't know how this could possibly have anything to do with you.

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Some provided steps to verify the request and protect the teen’s information.

ieatthatwithaspoon − NTA - the CRA is not a police force and they don’t arrest people. Tell your sister that if the CRA needs to speak to you to verify...

Don’t have anyone call you and don’t give out your SIN or other personal info unless you yourself initiate the call. If the CRA legitimately needs your SIN for beneficiary...

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Pristine_Soil3673 − NTA and do not do it! i must google what a sin number is and google told me following To work in Canada or access government programs and...

Your SIN is private and it is illegal for anyone else to use it. You are responsible for protecting your SIN. last part,protect your SIN!

larmik − Now would be a good time to check your credit report and lock it down (if you can).

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A few questioned the sister’s intentions or her boyfriend’s influence.

Accomplished_Cow7279 − The only way to get jail time from the cra is to commit tax fraud/evasion. As long as your tax declaration is accurate you’re okay even if you...

My guess is that BF wants to declare the “gifts” he gave her to get tax breaks. But that will leave her with a lot of taxes to pay. Her...

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HuskerCard123 − A Cruise is like 2k, and I'm pretty sure you'll find out soon she never booked anything. She could literally ruin your life. Time to block and protect...

YouthNAsia63 − This all sounds shady AF. Don’t giver her your SIN number, (whatever that is), no good can come of it. Do be prepared to not be offered free...

EffPop − If you don’t press 1, well, the CRA Police are coming to throw you in prison. Please wait while one of our agents (located in Bangalore)

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guides you through the process of dealing with your debts … to your country’s most powerful and sophisticated collection agency … by phone and without a shred of documentation? ??...

This story reveals the importance of guarding personal information, even from family. The teen’s refusal to share her SIN protected her from potential fraud, despite her sister’s alarming claims. Trust, once broken, requires clear boundaries to rebuild. The sister’s vague, high-pressure tactics highlight how fear can cloud judgment, while the teen’s caution shows maturity.

Would you share sensitive information with a family member under pressure? How do you balance trust in family with protecting your own security?

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