Rob and Michele Reiner's closest friends, including Billy Crystal and Albert Brooks, are "fiercely" protecting the couple's kids after their shocking deaths, a source tells PEOPLE Their children Jake and Romy expressed they were grateful for the "support we have received not only from family and friends but people from all walks of life"

The “Stand by Me” filmmaker and his wife of 36 years, Michele Singer Reiner, shared three children: Jake, 34, Nick, 32, and Romy, 28. Rob also had another daughter, Tracy, 61, whom he adopted during his first marriage to Penny Marshall.

Billy Crystal's co-star Mandy Patinkin recalled how he sustained a rib injury on the set of 'The Princess Bride' from the comedian, and why he didn't mind.

Rob and Michele Reiner were found dead from stab wounds in their Brentwood home on Dec. 14. Stay with Newsweek for the latest.