O Mother, Where Art Thou?

Caitlin finds love with an older man, Tom -- whose daughter, Tracy, flirts with Charlie. Meanwhile the Mayor is depressed by the anniversary of his mother's death, but Carter introduces him to a woman, Christine, who cheers him up in more ways than one. Later, though, Carter reveals that Christine is the receiver of the Mayor's mother's donor heart, potentially threatening their relationship.

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S06E14 - Rags to Riches