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As someone who's decently familiar with the strip, I can say with a certain amount of confidence that the DeGroots really don't pay much attention to Luann or older brother Brad unless they do something to irritate them. This is sort of an annoying thing to see when it's Luann that's drawn their attention; instead of encouraging her to excel or finding out what her needs are, we see her emotionally-absent father and mental defective of a mother stand there sniping when it's not called for. What makes my soul want to vomit is how Nancy reacts to her son's dating Toni; she seems hell-bent on not liking the young woman based on her firm belief that since she's pretty, she'll abandon Brad for someone handsome. Given that anyone with an IQ above room temperature in Centigrade would be concerned that Toni would stupidly allow Dirk the Jerk back into her life and thus menace the other characters, Nancy's inability to see this tells me that Frank joins John Patterson in a rogue's gallery of comic strip husbands who've married their intellectual inferiors.