New Delhi, Dec. 16 -- A late-night family dispute at a Hollywood party has emerged as a troubling detail in a case that has shocked the entertainment world, following the deaths of actor-director Rob Reiner and his wife, Michele Singer Reiner, and the arrest of their son, Nick Reiner.

According to a report by TMZ, Rob Reiner, his wife Michele, and their son Nick attended Conan O'Brien's Christmas party on Saturday night, where a heated confrontation reportedly unfolded between father and son. Within hours, the celebrated filmmaker and his wife were found dead at their Los Angeles-area home, and Nick Reiner was later arrested on suspicion of murder.

TMZ reported that Rob Reiner and Nick Reiner became involved in a "very loud argument" du...