Elon Musk and his ex-wife, Justine Wilson, run in separate circles, their daughter, Vivian Wilson, said in a new interview. The Tesla CEO and the novelist and short story author — who share six children total — tied the knot in 2000 before separating in 2008.

Elon Musk’s daughter has said she does not know how many siblings she has. Vivian Jenna Wilson, 20, who is transgender, is one of the tech billionaire’s 12 reported offspring. She told Teen Vogue after the interviewer alluded to her siblings, suggesting people with many brothers and sisters often learned to fight when they are young.