World War Two
My grandfathers (Names are not mentioned for privacy reasons.)
World War One
My great-grandfather. (He served in the British Army in France. I don't know any more than that.)
I do not know of any possible ancestors or siblings that served in this war.
American Civil War
At the moment, I do not know of any ancestors who might have served. (It may still be possible, though.)
War of 1812
I might have ancestor who served, if I can prove that John Householder was the father of Barbara Householder.
I don't know if I have any ancestors who served. I haven't had a chance to determine that yet.
As you can see, I still don't know all of the possible ancestors who might have served. I have only included the World Wars and American wars as though are the only wars that I am certain that I had ancestors serve in. I did not include European wars (outside of the World Wars) because I have not had a chance to research if any of my ancestors did serve in other wars.