Probably both. Washington is a community property state. It depends on when it was purchased, whether it is owned by the Gates or by a corporation, what any prenuptual agreement says, or whether or not they agree to some other settlement.
Bill and Melinda are going to feel really stupid when they get to the afterlife and realize they mis-used their funds on humanitarian causes when they could have been building the Kingdom of God instead and guaranteeing their entry to the CK.
This is why they say it is easier for a camel to go through the eye of the needle than for a rich man to get to heaven.
Bill G, Mark Zuck.., and the mormons are all in competition for buying up the farmland. Bill more so wanting farmland. Zuck just wants his island paradise free from neighbors.
Bill donated $2.2 billion to the William H. Gates Population and Development group under the United Nations Population fund in 1999. By 2007 it was at least $30 Billion to population reduction related programs. That's quite a bit of money if you were to add inflation and today's dollars amount. [$47 Billion in 2021 money value]
The church barely gives anything like those numbers. They have the money.