Rob Reiner and wife Michele Singer Reiner had an uncomfortable interaction with son Nick Reiner the night before they were murdered. A source exclusively tells Us Weekly that Rob, Michele and Nick, 32, attended Conan O'Brien's Christmas party on Saturday, December 13. Nick allegedly acted "creepily" at the celebration before leaving, according to the insider. "Nick was going up to people at Conan O'Brien's party asking if they were famous," a source adds. TMZ reported that Rob and Nick got into a "very loud argument" at the gathering, which other attendees overheard.