Sia reveals she is already a grandmother after becoming mom to two 18-year-olds last year - USA TODAY

Sia has been promoted from mother to grandmother after adopting two 18-year-old boys who were aging out of the foster care system last year https://www.usatoday.com/story/entertainment/celebrities/2020/06/30/sia-already-grandma-year-after-becoming-mom-18-year-olds/5353506002/