So I am genuinely conserned for my unborn niece my sister lied to all of us, and is keeping it hidden from our mom.

Shes 28 weeks and she had a kid before so she doesn’t show much but I feel like it’s important. She drank to try to “ induce.” An abortion which makes no sense to me. I get shes also going through depression because the father of the baby wants nothing to do with her since she hid the pregnancy. Should I tell our mom or call cps