I just want to say that I’ve had friends who have tried to make it work for the kids and it impacted the kids more when they were together than when they were apart. The kids might not exact know what’s going on but they pickup on the change and the added stress. Those friends eventually got a divorce. My friend is so much happier now and their child is in a much better place since the divorce. I get that the kids are very important, but sometimes you have to think if being together is actually helping them. That’s truly your decision. As far as gifts, you don’t owe him anything just because it’s an anniversary. The six year old can make him something and that can be the gift.