CBS News on Instagram: "Nick Reiner, the 32-year-old son of Rob and Michele Reiner who is in custody on suspicion of murder, was last seen with publicly his parents on Saturday night at Conan O’Brien’s A-list Christmas party, where he got in a heated argument with his father, according to two sources who were there. On Sunday, the Reiner’s daughter, Romy, found the couple in their home with multiple stab wounds and Nick was subsequently arrested and booked on murder charges. Here’s what we know