Well, lookie who's dressed up as Santa!
Daimon started out as Son Of Satan, of course, but at some point Marvel decided that that was a little too taboo or them, and started a series of retcons/revelations that Daimon (and his sister, Satanna) were really the offspring of some other, more minor lord of Hell. (Satannish? Really? "He's not actually Stan, he's just a little bit Satannish!")
So ever since, you'd be hard pressed to find a reference to him as Son Of Satan. But, at least for the purposes of the Power Man And Iron Fist: Sweet Christmas Annual #1 (2017), Satan is back, baby!!
And remember--this means that Disney owns Satan. Where's our animated feature, guys?