In Texas, the courts don't usually award more or less support if women want sex dating the non-custodial parent choose a more than standard visitation schedule The non-custodial parent (and this is defined by more than just where the does or doesn't live for the majority of the time )pays the support to the custodial parent. You have to go back to the original divorce decree to what you actually legally (on paper) have in place now. Who has primary right to establish residence for the? Does your husband share in the educational decisions (on paper not in real life?) the medical decisions, etc Go back and look at what the original decree says then you have a better idea of whether or not term there might be a conflict with your step 's mom as far as her working with you guys. Psychologiy I tell you this no matter what it is that you do or provide or give to your step , his biological mother always be somewhat unwilling to let you have more of your step than you already do sometimes whether it's in the best interest of the is irrelevant when you are dealing with a mommy who doesn't want to share her own flesh and blood with the "other woman " I'm not suggesting you don't have his best interests at heart it's convincing his mother of that. Put the shoe on the other foot would you be willing to give more of your biological "away" to another woman? It's a toughie hopefully you can all sit down like grownups and explain what and why you want what you do. Did I how old your step is? After about 12 years (I think) of age, he can decide where he wants to spend the majority of his time.