Hi, I agree with Debbie, I would suggest you plan lots of outings where the kids can run around outside kicking a football, taking them bowling, to the park and visits in to the country, seaside etc. where they are not confined to the four walls. This should encourage them to get to know each other better in a situation where they can let off steam and be as loud and boisterous as they want to. Good luck, they probably just need time to adjust to each other.