It's kinda long but please read

My oldest sister(we gonna call her Tee) has 3 children (a 7 year old girl and 2 boys 3 year old and 8 month baby)...Tee and her baby daddy lives with my mom and my middle sister. So Friday Tee's 7 year old daughter was getting off the school bus to go home only to find out nobody was there to pick her up (she goes to a school in a different city because they were living there and it's almost the end of the school year and Tee didn't want to change up schools yet) nomrally Tee always has someone to take her to get her 7 years old daughter but Tee just recently got a car and on that Friday my 7 year old niece was on the bus stop for an hour until the bus driver passed by her bus stop on his way to return the bus back to the school and the bus driver called Tee and she didn't pick up so he called my mother and my mother freaked out. Now my mother does not have a car neither does my middle sister so their trying to find a ride to go get my 7 year old niece and they are trying to get in touch with Tee. So Tee finally answer the phone and they tell her what's going on and she's like oh my baby daddy has my car and Tee was at the nail shop (her baby daddy is a felony who does not have his license and also sell/used drugs) and they don't know where he at. So my 7 year old has to stay on the bus stop for another hour until Tee picked her up. Sooo during that hour my mom calls the police cause she's scared for     Her granddaughter (there's twisted and sick people in the world) and the policeman sits with my niece until her mom gets her. So Tee is all mad at my mom and she tells my mind mom she does even care if she's dead or alive your nothing to me and she was cussing my mom out and Tee told my mom that she can never see her children anymore and now my mom is heartbroken and idk what to do