Easter, Easter, Easter. It's the one holiday we have never had conflict with the other family; no every other year, split the day down the middle. Nothing. Mostly I would say this is do to the fact that majority of Easter's have been on the other families weekend and we have never really made a big deal about it.
The first year we realized that we wouldn't have the kids for Easter Sunday, we made an executive decision that the Easter Bunny would come the weekend before. EB decided to set an Easter Egg strategically in their bedrooms so when they woke up they might stumble upon it and wonder "What the Heck!" And that they did.