You are welcome. I owed you one. The Stanislaus county clerk has some births on-line athttp://criis.com/stanislaus/official.shtmlhttp://criis.com/stanislaus/official.shtml Some records list mother and father's full name. I looked at 20 or 30 PETERSENS and gave up. If you wade through them all you may find one whose father is Hans N., which might give you his wife's maiden name.