Jack Osbourne's wife, Aree Gearhart, is speaking out following the death of father-in-law Ozzy Osbourne. "I'm pretty sure I have the coolest father in law around, and the best papa to my kids," she wrote via Instagram on Sunday,

Ozzy and his wife, Sharon Osbourne, shared three children: daughters Aimee, 41, and Kelly 40, and son Jack, 39. The late rocker also had three other children — Elliot, Jessica and Louis — from his first marriage to Thelma Riley.

Jack Osbourne’s wife Aree Gearhart posted a tribute to her father-in-law Ozzy Osbourne on Instagram on Sunday, Aug. 3.