Hi there @Chumble_Juice 
! Welcome to discourse 
.
This method of gaining settlers/hearthlings had been suggested and been brought up for countless of times.(I’m not saying they should stop, just keep the ideas flowing 
)
Here are some of the threads that talks about procreating and something along the lines:
And here is real long one that goes way back…(I have stumbled upon it, in the dusty ruins of the ancient archives of the long forgotten Phoenix Empire…)
But I really like your idea of a family tree 
! Really makes it that hearthlings in your world can have connections with one another, and give a sort of “history” behind their surnames 
.