Anonymous wrote:8 figures is a ton, even split in half. I would give to both equally. The only time I say otherwise is in the case of severe disability where the adult child needs lifelong caregiving.
+1
You don't know what the future holds. Your more successful child could deal with divorce, mental or physical health issues, a child with special needs, a collapse in their industry, etc. Your less successful child could ultimately wind up better off.
To be clear, I also think that your less successful child may already be dealing with headwinds you might just not be aware of. What reads as lack of discipline or effort to you now could actually be anxiety or other challenges over which they may not have control right now. Some of the most successful adults I know were mildly aimless as teens, went to lower ranked colleges (some even taking more than 4 years to graduate) but really put it together later on.
As you said, success in life is often mostly luck disguised as hard work. Assume either or both of your kids could hit bad (or good) luck and both have the same capacity to work hard.
I think equal division is also equitable.