By "give their wealth to their children", Pinker doesn't mean "when they die". He's referring to the more general observation that parents want to take care of

By "give their wealth to their children", Pinker doesn't mean "when they die". He's referring to the more general observation that parents want to take care of their kids as well as they can. But they do that in a strictly unfair way: they prioritize their kids over all other kids simply because they happened to have spawned them, a property the kid has zero control over.