Thank you so much for that info. Since posting this, I found out a lot more details on my father-in-law. But, knowing of that home helps, too.
There was a sister, who had contact with my F-I-L as an adult. A younger brother was adopted out and no contact was ever made, so, most likely, he never knew he was adopted.
We were thinking the name was not the real last name (Boggus/Bogus- fake/not real)but, it was the real name! Now, my husband knows of half siblings, who chose not to have any contact with my husband.
Thanks for the info.