You sure you're in the right thread, because Christine has an estranged adult (asshole) son from a previous marriage. He's estranged because of the divorce and her drinking problem back then. She tries to win him back, or at least start a civil relationship with him, and her husband has to help convince the son to not be a dick and give Christine a chance. It's not a minor part of the story. Shit, Kelly is even planning on using her nympho roommate-girlfriend-pet to seduce the son just to hurt her stepmom in one of the story branches. So, yeah, there is a son, he's just not the MC's son/Kelly's brother.