Did you wonder if the son was gay?...
Though the main sexual tension was among the triangle of mother-daughter-handyman (Darren), did anyone think that the son, who was Darren's actual employer, also gave hints of being attracted? E.g., didn't one of the women characters say something like, "no one would want a man like you" to Darren, to which the son muttered something subtly insinuating like, "that's not quite true"?
Also, there were glances, as well as the odd chemistry in the two men's drinking scene, plus the almost scorned fury in the son when he later fires Darren.
If I'm right, it's as though the needy, self-abusive, dysfuctional Darren had a knack for being the touchstone of nearly everyone's illicit passions and drove them all (mother, daughter, son) in varying degrees toward a misguided attempt to "complete" themselves by bonding with him.