lake My husbands family does not accept me or my kids?

okay my husband and I have been together for 2 years, I have 2 boys from a previous marriage 10 and 14, and he has 2 boys from his previous marriage 11 and 13 who he has custody of, well my family doesn't have much to do with me and my kids father doesn't have anything to do with my kids, my husband comes from a rich family (and I mean rich!), well for christmas my kids don't get anything from his family but his kids get about 20 expensive gifts from his family, and about 10 from their mom on top of the ones we give, we give each of the kids about 10 presents for christmas and 6 for birthdays but on the day after christmas presents come rolling in for his kids and my boys feel left out, also his family comes and picks his up and take them on trip to places like Paris and Italy and Hawaii and other places but doesn't invite my kids, my husband says that its because they have a special bond, but my kids feel left out, it is not like his kids are spoiled they are very well behaved and respectful but they just have more. My kids don't have any other family, they don't have a dad so it hurts them when my husband spends individual time with his kids and even collective time with his kids but only includes mine on occasion (I know that his kids are entitled to special time with their dad but my kids are just feeling bad), I mean my kids are not the best behaved but they are not animals, even at family gatherings my hubby's nieces and nephews don't play with my kids as much as they do his, what can I do?there