Well, when it comes to her showing favoritism in the kids, to the point of not feeding them at the same time and not allowing S14 call you Dad.......that would help me make up my mind. But, that's just me. This was two families that joined. You have to protect your son's mental & emotional health....as well as your own.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!