LEGAL QUESTION REGARDING CUSTODY OF CHILDREN!?

my ex left me a while back and because he comes from a well off family and i was a stay at home mother he bullied me into letting him have managing conservator over our 2 youngest children (he didnt want our oldest) well within a few months he got a new girlfriend who was very abusive to my children and CPS took them away from him but being the custodial parent he got to chose where they went and he chose his grandmother well now 3 yrs later i put myself through college got a great job hired a lawyer and filed for full custody, his grandmother is very mad at me and is trying to fight me i have no doubt that the judge will grant me custody but the question is will he also make the paternal grandmother surrender their belongings? and will he grant her visitation? (she is a very nasty woman and she tries to turn my kids against me) Please dont put me down for it taking so long for me to get them back when he left i had nothing at all it took a bit for me to get my degree and save up for a lawyer.... and i didnt got the three yrs with out seeing them they were at my house every weekend summer and all holidays