We have no children of our own but my dp has two children to his ex girlfriend. He has had them two days a week (Overnight) since they were very young. Sometimes it feels as if we don't really know them. They have a seperate life with their mother and her partner and it seems there's always that barrier. Its almost as if a niece/nephew relationship with them. My partner doesn't think so but what has he got to compare it to? What's your dps relationship like with his dc? Is it different with your biological children together?