So, I was young and dumb when I got pregnant at 19. I had an abusive pregnancy. I was so naive and missed all the signs that my now ex abused prescription pills.I learned quickly that I was not going to be with him and allow him to endanger my son's life. Well I left but I still had to deal with him because he's his son too as he signed the birth certificate and all. So after I gave birth he picked up a nice little heroin habit (sarcasm of course). Anyway, it's now 7 years later and he has been in and out of prison for a number of felonies drug charges. he hasn't seen his son, even though I've given him chances for a supervised visit and he'll make up an excuse that he's suddenly busy. he goes on Facebook every time he gets out of jail acting like he wants to see him and he misses him but he gives no effort other than bad-mouthing me about how much I keep him from his son. he'll stay out a maximum of two to three months and he'll go back in for some other stupid charge. my question is I live in the state of Texas, how do I go about filing for full custody? I have no idea where to start I already went to child support but that's not the division to go through. my son is now 7. the last time I heard from his father was about three years back but I don't want him to have any rights to him anymore because of his drug habit. the reason why I'm going about this now is because I am now more stable in life and I'm thinking ahead to when and if his father ever comes out, tries to pull the "I'm his dad" card and take him. Which I don't feel comfortable with at all because the people he hangs around are all drug addicts in some form or another. whether it be pills heroin or cocaine ,I know this because I keep tabs now and then on Facebook and one of his relatives kids goes to school with my son I ran into her and she updated me on what his family has been up to and she says they're up to the same old shit. which is up to no good..