I was reading a story a while back about a mother and two sons. One son was either given up for adoption or ignored (I don't remember). Mom and favorite son were quite wealthy and forced adopted son out of business.
Does any of that ring any bells?
I've read a couple where the least favoured son won through in the end, one was by WTSman and the other by Telephoneman. On the off-chance that you misremembered something:
- https://storiesonline.net/s/13500/speak-now-or-forever-hold-your-peace (WTSman)
- https://storiesonline.net/s/29760/david-jenkins (Telephoneman)