Well, again, start accumulating capital, if it is such an unfair advantage.
"I, too, am in favor of a 100% wealth tax upon death. No more freeloading failsons."
I am absolute against such a thing, in fact I consider it an insane proposal.
It seems one of the fundamental human rights should be people being allowed to provide for their children.
People work to have successful children. It is absolutely incorrect that all children should have the same starting positions for a fair world. If a couple works hard to earn money, and others don't work and instead pop out 10 children, why on earth would it be fair to take money from the hard working parents to distribute it to all? I know many people who would like to have more children, but feel they can't afford them. Why should they be punished for being responsible.
It even starts before people have children. They work hard to be attractive and find a good mate, to improve the odds for their children. That is basic human nature.
The acts of their parents are not the children's fault, of course, and everybody should be given a fair chance to make it in life. But there are limits. Both strategies can be valid (have few children and try to give them a good head start in live vs having as many children as possible and leaving them to their own devices), but it would be unfair to politically punish one strategy over the other. At the very least, if you take away money from the responsible parents, you should have to limit the behavior of the irresponsible parents.
The only way to make things completely equal for everyone is to disallow people to have children, and instead rise future children in clone factories. Why should that be considered desirable?
And even more basic than that: people should be allowed to do with their money as they please. Including giving it to their children.