What you've found is my husband's maternal family for sure. His grandmother (Mary Ondayko Bracken) is not listed as part of the family in either census; she was the youngest, but had her first child in 1928 (my husband's mother: Delores Joyce Bracken). We think Delores Joyce was born in Allegheny County, Pittsburgh.
I can't really account for Mary not showing in the Census of 1920. However, all the boys listed with Michael and Anna are remembered uncles. There may have been another girl in that family, also not listed. Is this usual?
The Andyks as a surname variation is a new wrinkle for me, as I am at the very beginning of trying to sort out this family.
I really appreciate the information you provided!