Two And A Half Men (2003) - 4x06 - Apologies for the Frivolity

Charlie cannot see that he's dating a younger version of his mother.

Though Charlie despises his sharp tongued, passive aggressive mother, he's strangely attracted to Lydia, an attractive, blonde high-end real estate agent -- just like his mother. Unfortunately, the similarities don't end there, and the relationship begins to seem a little too familiar for comfort.