United Kingdom, Dec. 16 -- Rob Reiner and his son Nick Reiner reportedly got into a heated argument on Saturday night (13.12.25).

The filmmaker and his wife, Michele Singer Reiner, were both found dead at their Los Angeles home on Sunday, and Nick - who has been taken into custody - was seen having a heated argument with his dad at a Christmas party hosted by Conan O'Brien, according to People.

One source told the publication: "Nick was freaking everyone out, acting crazy, kept asking people if they were famous."

Rob and his wife left the star-studded party following the argument, TMZ reports.

The married couple were later found dead at their home, and Nick was subsequently arrested and charged with murder. He is now being held withou...