DH and I have been together 3 years and got married in August. I have two DSs, 6 and 4, who live with me and he has a girl, 11, and boy, 9 who he has 50% of the time. Him moving in means they will be here 50% of the time. I have posted separately about this but I had a horrible break up with my ex after he had an affair and left us for other woman. DH also had an affair and split with his ex which does cause some trust issues. They would be moving in with me as I have a 6 bedroom house and they have a one bed flat (kids share a room and DH sleeps on the floor when they stay!). We obviously have more than enough room although I am thinking of getting an au-pair which would mean his DCs need to share a room (one room is used as an office) which doesn't seem to be an issue given that they share at both their dad's and mum's. All the kids get on very well and seem to be looking forward to moving in but I am nervous for a number of reasons. Aside from the cost issues (who pays what etc, which we have not discussed in detail, I am hugely worried about losing control and this not feeling like my house anymore. Once they move in it will have to become home to his DCs and i am not sure I feel ready for that. It feels like it is my kids and my home and noone elses! It's not helped by the fact that I am the higher earner and use a nanny (or an au-pair) which DH works fewer hours and so has never used childcare. He will basically be at home 3 with his kids 3 afternoons a week whilst my kids are being looked after by a nanny. His kids go to school 40 minutes away from where we live so he will have to collect them from school and commute back to ours on the days they are with us. Although I like his kids, there are also tensions around parenting styles. His son, 9, is very clingy and quite demanding and it feels like he always wants his dad to himself, which is quite hard for my little ones to handle as when DSCs aren;t here, DP is available to them. Just feel that we will both want time with our own kids that we won't get and that his DS will be sulky and resentful because of it. Also worried about costs. Am struggling to pay a large mortgage and worry that I am going to end up picking up the larger share of the food bills etc. I tried to tell DP how I was feeling which he interpreted as me not wanting them to move in so need to broach this really carefully. Any advice?