These are characters who are aunts: biological, adoptive, marital, half- and step-, as well as older ones, including (great-,great-great-, etc.).
“Becky Pritchett is or was the sister of Jay Pritchett. She is mentioned in The Kiss when Jay...Becky Pritchett
“CeCe Williams is the sister of DeDe Pritchett who is mentioned in "Valentine's Day 4: Twisted...CeCe Williams