I became a part time single father after our divorce. It took a long time for my ex to find a guy that was not a "bum" and since I had my kids every weekend I would see whoever she was with or if my kids told me they wanted to be with me, I would just take them. At times my ex complained but when I calmly told her I will take the kids until your life is back on track or I can go back to court and probably get full custody. (I always kept full and complete documentation (hard ass perhaps, but it was for my kids).