Question about signing dependency paper for custody of a child?

My mother has filed to receive temporary custody of my daughter while my daughters father is filing to get sole custody of her, they have filed what is called a "dependency clasue" paper stating i am unable to care for her. all of this done for reasons that will take alot of typing to explain. it is not that i cant care for her or that i haven;t taken good care of her bc i have, she is very hard to control and has done better with living with her dad. my question is i also have a son, not by same dad, i want to know if they can say that because i let my mom have temp custody of her under that depend thing can they come back and say that maybe i cant care for my son either? i have plenty of people that would always say i have always provided excellent care of both my kids, which i have, just want to be sure i am prepared for anything that might happen bc of this. any advice or tips helpful. thanks.