The family of the late cricket great Richie Benaud is fighting over his estate.

The legendary cricket commentator and former Australian captain died in April in a Sydney hospice at the age of 84 after battling skin cancer.

His passing was mourned around the cricketing world with everyone from political heavyweights to Hollywood superstars expressing their grief.

Now, his ex-wife Marcia and their adult son Gregory have launched legal action against Benaud's second wife Daphne in the NSW Supreme Court.