Brand, the fact is, you are only one of the people they need to see when they visit, and they are the only people you go to see when you visit them. That's not them showing any lack of favouritism, just a fact of life. It isn't that they don't want to spend more time with you, it's just too many miles to cover and too little time.
If we go back to the uk, we spend the entire time schlepping around trying to fit in as many friends and relatives as possible (most of whom can't afford the trip to see us). Those that do come to see us, are coming to see us... Because no one else they know lives here.
so if you want our undivided attention, you have to come to us.
It isn't meant to make you feel unloved, it's just a fact of life.
We have to time visits carefully, just as you do - presumably you choose to travel at Easter so that your dc's don't miss too much school. Well, so do we. School holidays don't match up with uk hols, so that's just plain unfortunate. I can't take my kids out of school in term time, which unfortunately means your kids are in school. But, you know, that could be something of a blessing - if your kids were on hols, then they would feel even more beholden to spend more time with you, and let more people down who don't travel to see them at all....
It is such a juggle, and is so mixed up with guilt for leaving, and guilt for not being able to stay longer, and guilt for everything really...
It is hard. But hey, at least they are visiting.
Try not to take it so personally!