A dad just signed a $40.4 billion personal guarantee so his son could buy Hollywood. In 14 months, the Ellison family bought Paramount for $8 billion, then won a bidding war against Netflix for Warner Bros. Discovery at roughly $111 billion. Warner Bros, Paramount, CBS, HBO, CNN, DC, Nickelodeon, and TNT Sports now sit under one roof. Next week the combined company takes the name Skydance. Netflix should have won. Warner's board had already signed an $83 billion deal with them and rejected…