RM, I mean this gently so please don't take offense.. you really need to scale back your expectations for your Christmas experience with your Dad and family, or you're going to continue getting hurt. They've shown for years that presents are not important to them, and that they don't enjoy or value the gift-giving aspect of Christmas. Actually, it sounds like the entire holiday might just be no big deal for them. Your dad did get you a gift.. that's something. My dad would generally duck into the back room and write out checks at some point during our Christmas dinner.. we just got used to it.
I understand that for you, the gift-giving joy is a major part of your enjoyment of Christmas, but you are setting yourself up for disappointment and hurt by expecting them to conform. It's not going to happen.. you can't control that, but you can control your reaction to it and how you let it make you feel. Just the fact that there's a possibility that it could "affect your Christmas" tells me you're taking the whole gift thing way too personally, it's not a statement on how they feel about you, just about gift-giving in general.
Might I suggest that, since you love buying/wrapping gifts, you might consider doing something like an Angel Tree? That may satisfy your need to give, and I guarantee that they will go to someone who will really appreciate them!