I shared my dad's story earlier, but I also had a grandfather who served in WW-1. Unfortunately I don't know much about him. I do know that he was gassed and suffered with breathing problems the rest of his life. He died in the early 1960's while in his early 60's. I was only 3-4 at the time and never got to know him.
That was my mom's dad. My fathers dad received a draft notice and reported for duty during WW-1. But was told that since he was a farmer his skills were needed more on the farm and they sent him home.