So my SO is trying to get full custody of his three year old because her mother had gotten arrested…

So my SO is trying to get full custody of his three year old because her mother had gotten arrested and is now is jail with felony charges. His daughter doesn’t know who he is and is close with her grandparents on her moms side. Well since he wants her with us CPS is now getting involved. It’s giving me very high anxiety and I don’t know if I want to live with him anymore.