Three ways to be a citizen, one line each
Form DS-5507 gives birth in the United States, naturalization and birth abroad to U.S. citizen parents a line each. A parent born abroad and naturalized later has a foreign birthplace and birth date in every record, and software can fill them on the birth-abroad line too.
The other parent’s years in the U.S.
The other parent’s presence table is for a parent who is a U.S. citizen or national, as the form says. Notes often include that parent’s student years in the U.S. anyway, and software copies them into that table, or into the affiant’s own.
A school’s or employer’s address for the home
University letters and employment letters carry the campus and office addresses, and their start and end dates differ from move-in and move-out dates. Software can take those for where the parent lived, and when.
Two marriages, one row
The form has one row for a marriage, and a parent who divorced and remarried has two sets of dates, spouses and countries. Software can pair the spouse from one marriage with the date or country of the other.
A stepchild, and the parent as “child”
The children’s table lists the affiant’s own children. A stepchild in the household notes, or the parent’s own birth certificate with “Child” printed above their name, can end up as a row.