Just saw your post and I was wondering if you found anything out. I am the granddaughter of Mary Johnson McManus who was the sister of jack McManus. She was from Muskegon mi. She always kept in touch with jacks kids because jack died young in an accident. She passes away 16 years ago although I still have pictures and info from her. If you want more information let me know. I may have it or can get you in touch with someone who does....we always wondered what happened to jacks children.