Sounds somewhat like the 'gay uncle' theory, where having 4 of your siblings kids pass on their genes is equivalent to having 2 of your own pass on their genes, but with future pairings included, which is interesting.

Stephen Baxter wrote a couple of novels that explored the first theory a bit Destiny's Children series, where gur pbybal riraghnyyl ribyirq vagb n uvir, jvgu rirelbar fhccbegvat n tebhc bs dhrraf gung gurl jrer eryngrq gb.

The addition of future contributors to the bloodline as part of your utility function could make this really interesting if set in a society that has arranged marriages and/or engagement contracts, as one arranged marriage could completely change the outcome of some deal. Though I guess this is how a ton of history played out anyway, just not quite as explicitly.