I've been working on extending a few collateral branches of my family tree. I've been trying to trace the descendants of my Great-ect-Great-Aunts and Uncles (I wrote about why this is important here). While doing this I realized something about how I relate to some of the half and step families in my tree. It's a little odd, so I'll explain it with an example.
The children of Amelia's previous marriage are just as much Nathan's half-siblings as the children of Williams's previous marriages are. Why did I only look at William's kids? Researching Amelia's kids should tell me more about her and my half-aunts and uncles.
I think it has to do with surnames. William's children shared the Britt surname with Nathan and Amelia's did not. I'm not really sure what other reason there is that I completely disregarded my Great-Grandfather's half siblings. I can think of at least one other family where I've done something similar.
Well, at least I recognize the holes in my research and can now correct them. Maybe I'll connect with some new cousins when I'm done.