I was widowed so my kids live with me and my new husband all the time. His kids are with us half the time. I seem to still manage to go to many more of his kids activities,  Drive then a lot of times,  and watch more of their sports. He seems in my mind to prioritize his time and what his kids are doing much above me and my kids. It causes a lot of fights because I just want my kids to feel like they have a dad.