I have been a SM to two awesome boys SS6 and SS9 for the last 5 1/2 years. My DH and BM have a consistent split schedule- SS's spend 4 days a week with us, 3 with BM. I have never had a relationship of any sort (good or bad) with BM until the last few months when DHs schedule changed and I was the one picking them up from or handing them off to her. Everything went completely fine (a little awkward, but friendly). My SS6 7th birthday is in a few weeks, and this is the first party she's had that I've been invited to by her.