A parent of Jed Whedon was born in the month of August.
Although not constituting completely reliable evidence, several congenital traits such as attached earlobes, a widow's peak, or the cleft chin, may serve as tentative indicators of (non-) parenthood as they are readily observable and inherited via autosomal-dominant genes
 Examples of third biological parents include instances involving surrogacy or a third person who has provided DNA samples during an assisted reproductive procedure that has altered the recipients' genetic material

