Again, thank you for all the replies
For the folks commenting on the "heart melting" comment. I'm sorry if this wasn't clear, but that was an insight I had not had before this thread. And I appreciate people making it clear.
I also appreciate the people who could see my post in the light of wanting balance. I really do. Right now, there's not much issue of balancing SS's needs with DD's. She's too young for activities. But we are after balance.
If it helps folks see where I'm coming from, the only somewhat heated discussion DH and I had over this issue was one of the times he made arragenments with his ex-wife to spend a Sunday doing baseball activities without consulting with me first. He was caught up in the fact that he shouldn't have to "check" with me before making plans. I was trying to get him to understand that the reason I'd like to be consulted, is because a committment to SS is a different level of committment than the other ones we make. If I make lunch plans, or plans to see my family, or plan an activity, I can always cancel. Commitments he makes with SS should not be broken, short of unforseen emergency, and I'm committed to making that happen. So, because it's a commitment on both our parts to spend an extra day with SS, I would like to feel involved and that the commitment is coming form both of us.