10 is a tough age for any kid so be kind and gentle. Only thing I can offer is my step son was 8 when I married his father, and he ask me one day "Why don't you like my mom?" and I told him I liked his Mom. His Mom and Dads problems where between them. And I did not want to take any ones place just wanted to be someone he could talk with if he needed. Kids also feel guilty if they think one parent is happier than the other they tend to side with the poor me parent. at least that is what my step son did. Until he realized life is what you make it. I did everything I could do to keep the peace between the two x's which I would not advise as it took it's toll on me. I am since divorced from his father and up until his Mother passed away we were good friend we had something in common both x's of same man and Mother's to a great kid!