I have Clarence as married to Elizabeth (??) and they had children named Donald---Gerald----Patrick.I also have Clarence as being born in Clinton, Iowa on the same date as you have. I'm not much on research, just take what people tell me, so my information can be really wrong.
Oh my name is Tom Holle. I was born and raised in Clinton, Iowa and live in K.C. Mo. for the last 40 years. My father was Donald but not the one you referred to..My grandfather was Carl Holle who was the son of Richard A. Holle brother of William Armenus Holle.So that is some of how things are tied together.
If you could trace your father back (and forward) for me with dates I would appreciate it and would be happy to give you any information I have.