LAS VEGAS, Nev. — Donny and Marie Osmond have cancelled their Las Vegas shows for the rest of the week as the family continues to mourn the death of Marie's 18-year-old son.

"She needs to spend more time with her family," her rep tells People. "She's still processing everything and it's really rough on her."

The sister and brother duo resumed their Donny and Marie Show at the Flamingo Hotel in Las Vegas on March 9. The Sin City show was previously suspended after the death of Michael Bryan, who committed suicide on Feb. 26.

The Osmonds are expected to resume performances on March 23, a rep for the hotel said.

The entertainment siblings first took the country by storm with the debut of the Donny & Marie variety show in 1976, becoming the youngest primetime hosts in television history.