This is such a difficult question to answer, as my family has undoubtedly done countless things to enrich my life.

Well, for starters, they had me. Then they did everything to ensure I had a good life, gave me good values, a good education and supported all my career decisions.
All of these things sound typical, but when you think about the millions of homeless and/or orphaned children without a roof over their heads and two square meals a day, you start realizing your sheer privilege.
So, it is not just a thing or a couple of them I would like to thank them for, but being a steady foundation on which I have built my life.