I feel like the only way to do that is to make it so property is returned to the community rather than allowed to be transferred as inheritance. This is a topic I've thought a lot about and considered quite a bit... and there are a lot of problems and loopholes that pop up. Still if we live in a society in which people do not need legacy-money to thrive then returning that legacy to the community at large is not that big of a stretch. I feel that communities will pop up in which members feel obligated to donate everything back when they die rather than trying to create a family dynasty. Maybe that wishful thinking.