DEAR SOMEONE ELSE’S MOM: My daughter and her husband are the most competitive couple I know. When your daughter and son-in-law were in school and competing in separate sports, it was one thing. Now they’re competing in life with each other, and that holds the potential for trouble ahead. Like many former athletes, they might not be aware that they’re approaching life like it’s a championship. That’s not necessarily a bad thing, but it’s also not necessarily a healthy thing for a couple when they’re each other’s rival.