where do we start?

Ok sooooo my fiancé and I have been together for two years now and last year his daughters mother stopped him from seeing her all because he’s in another relationship and we had an altercation but he’s been asking can he see his daughter since May and she told his mother that he can’t see her b/c of me but I honestly think she won’t let him see her even if we are together or not out of respect I went out of town 2 weeks ago and he asked for her constantly and she continued to throw it off so he wouldn’t get her. She even put him on child support too but Y’all I’m soooo tired of coming home to him crying or moody because of the situation I just wanna help him and any way possible to get joint custody or something, I know it’s not my place to say anything but I’m all for what’s right! Any ideas on where do we start and Judges, Lawyers or something on here!! I need, We NEED ANSWERS!!!