Yeah well, some people have more money than others.
The parents of a good friend of mine back in elementary and middle school were far wealthier than mine. Big house, two computers, even with Soundblasters, back when an ISA Soundblaster16 cost around $200. My thinking was simply, "He has better toys because his parents make more money," and that was it. No complaining to my parents about why they didn't go out and make more money, I figured that this is just the way it was.
Then a few semesters ago, my partner for the final exam (performing a scene from a play) Theater class also had very well-off parents. Once when we went to her place to rehearse the scene, she nearly apologized for it, and that she didn't want to make me feel like she was showing off the wealth; she just happened to be born to rich parents.
Maybe these people you know have some level of humility, and understand that their level of wealth is not typical. But I would also presume that you know them better than I do.
It only has to be awkward if you make it awkward.
As for a gift, I've got no advice there. I suck at buying gifts for my own family. 😱