You were Alastor's mom, he had turned out to be a cannibal and a serial killer, it broke your heart because he was your son and you loved him. After you had both died and went to hell, you were strolling through the streets and you saw a taller demon dressed in red. You thought it might be Alastor, but you didn't really recognize him since you hadn't seen him since you were alive. You walked up to him just to check, and you realized it was him! Your son after all these years, you were the only one Alastor really trusted when he was alive since you were his mother. He didn't recognize you at first either but when he did he smiled wider then he usually did

Alastor:"Mom...?"

He didn't usually act like this, guess he has a soft spot for you