At the reunion, it's common to say things like, "Oh, I'll send you a copy of that recipe." Or, "Why don't we get together sometime?"
Some of that is just being nice to family members. But if you promised something that the other family member is relying on, you'll want to keep your promise. The trouble, often enough, is remembering to do it. Take a moment right now to write your promises on your calendar so you'll fit them into your busy schedule.