how about you stop being so materialistic?
they had a ‘basic’ home, they just chose not to stay there all the time. and anyway, i’m sure they would have seen all their son’s homes and ‘their own homes’ too since that would be their right as parents. when all your kids are grown up, married with children and you have accepted the fact that you are going to kick the bucket sooner or later you won’t care to keep a house. hopefully you will care more about spending time with all your children.