There are two sons at home. Parents built a house for their eldest son's homestead when he was a child. Now that both sons are older, who owns this homestead now?

There are two sons at home. My parents built a house next to their eldest son's homestead when they were young. Now that the two sons are older, this homestead should still belong to their parents, because it was built with their parents' money. If they have the money to build another one, every brother will have one, which is very reasonable. Parents or not, both brothers can live.