Custody dispute contested custody social study lying about her address?

ok my ex is a real piece of work i have had custody of my son for 7 years now sole custody and she had no visitation well i let her see him cause i wanted to to do what i felt at the time was right well im in tx and after she decides shes a changed person mainly she had a babby and she prbly wants the tax credit she decides she wants him back my question is this we are working with an orginazation the domestic relations office they are a fruiend of the court and were assigned to mediate this she requested a study where they are going to examine both of us and say whos better for him to live with my issue is she is a complete liar maybe she is too ashamed to admit she lives in a mobile home or what idk but she lives with her bf in a mobile but she is telling the ppl at d.r.o that she lives with her mom *(mom has a nice house) i have been going by there( the moms) late at night and taking pics of the house late at night to prove she is not living there not once has her vehicle been there i have had her followed after scheduled visits and xshe goes back to the mobile that i know she lives it no im not a stalker i really could give a **** what this woman does with her life i just dont like her screwing with mine and im not going to put up with her lies anymore so will the daily pictures that are time stamped of the mothers house be enough to prove that she is not living where she says she is and also eneogh to get the social study done where she lives...also he has an upcoming overnight visit with her i dont want to piss off the court mediators but she is lying to me and them and im considering not letting him go till she comes clean about where she lives anyone have any input on will the daily pics of her not being there be enough to incriminate her or at least show her for the lying sack of @#$% she is