Anyone else????

Does anyone else take care of their nieces and nephew or grandchildren I do alll the time and sometimes I get upset when the littlest one askes for mom who NEVER spends time with her and if she does she always comes back with an attitude but it don’t take long for me to get her back to obeying and all but there was a couple of times from when she came home from a reunion and she was scared to go with her mom unless she said their gonna go see daddy she also had a bruise but ik I prob shouldn’t feel this way but I do and I’m afraid when they move to their house I’m not gonna see her as much and sometimes I feel like she is my own and I sometimes catch myself almost under-minding the mom and dad cuz I have had her sooo much even when they are here they stay in their room and don’t do nothing with her am I in trouble?