I have recently moved in with my partner. He has 2 sons, 11 and 10. They stay with us more than 50% of the time. Even on days when they stay with their BM, they seem to spend the evenings with us and just go back to her's to sleep. I feel like it doesnt matter what I try to arrange for myself and my partner, they always get in the way. He is obsessed with them. He wont ever ask the mum to run them to soccer practice or school clubs etc so we can do something together. It always has to be him. I actually feel more lonely being in this relationship than when I was single.