Rare post from me. I am interested in how this story is going, so I decided to briefly come back for 10 minutes.
This really does echo similarities to Jake LaMotta. Some family members reported him dead, other members and some reliable sources stated he was still alive. Lil Tay's Instagram page says she died, her father "can't confirm", and her brother is denying it. The "can't confirm" means he is either estranged and hasn't seen her in years or she is in extremely poor health (Tony Dow vibes). Here are some theories judging by historical deaths.
Lil Tay is dead and the brothers account is not real.
She died, but a typo or misunderstanding may have resulted in the media incorrectly assuming her brother died too.
She died, but her family members are trying to hide it from the press (*cough cough* JAKE LAMOTTA)
Her brother's story is true.
She is alive and this was all a hoax. Her Instagram account was hacked by a troll, her father has not seen her in many years, making him unable to confirm if it was a hoax.
She is in palliative/hospice care, mistaken by estranged relatives to be dead. (*cough cough* TONY DOW) This might explain why the authorities are not investigating this.
So far, I think the most common possibilities are 4, 5, 6, judging by the lack of death reports.
That's all I had to say. Bye.