I am the oldest of three. None of us was very successful financially but my situation was the most stable (and I am the most conservative spender). My dad’s first will divided his estate evenly among the three of us. Then he took one brother’s portion and divided it among him, his wife, and his three children. Then he wrote one son off and divided his share between me and the other brother (whose share was divided). The will allocated his money in portions to three decimal points.
When my dad passed, there was a huge amount of resentment. My brother with the wife and three kids, and I, single with one, each promised my out-of-the-will brother a third of the divided brother’s share. Then the brother with the wife and kids died without a will and with a huge Small Business Loan in default, leaving his wife and kids with not so much, since his inheritance from my dad was his only asset. The brother who was written out wanted my sister-in-law and nieces to hand over their inheritance to fulfill their dead dad’s promise but so far they have ignored him.
All this made me glad that I am single with one kid.