I do not know if I can be of any help. I do not have very much information and became a bit lost reading through the post.
My grandfather was a Daniel Joseph McCarthy III. I know his family came from Ireland to America and Canada My grandfather lived in Connecticut and then moved to California (Orange County/LA area). His mothers name is Irene McCarthy. I know his father (my great grandfather) divorce his mother and remarried a lady with several children. I know he was in the service for a short time and was born in 1925/blood type RH-O. He also had a sister who was murdered. He was married to my grandmother Clytie (Claytie)McCarthy (maiden name Butler). My mom, his daughter, Linda McCarthy Lane and uncle Daniel Joseph McCarthy(4th). If there are any connections please email me at firstname.lastname@example.org