Why do I feel like the forgotten kid in my wealthy family?

Because in many UHNW families one or two kids get cast as the heirs and the others become afterthoughts, and the casting happens early without anyone naming it. Kris Kluver, in The Dysfunctional Family Office, gives this voice to Tim Mitchell, the youngest, who tells himself he was never in consideration anyway and isn't sure if that's a relief or an insult. The role of the spare is real and rarely acknowledged. The fix is for the spare to claim a role on their own terms. Tim eventually does this, choosing veterinary medicine and explicitly asking the family to support his path rather than carrying him through theirs. The shift requires saying the thing out loud first. The family then has to decide whether to actually see and back the choice.