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If Teresa’s daughter is my daughters’ mother. Who am I to Teresa?

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Her daughter.

A good riddle has one possible solution. This one has way too many.

Imagine "Teresa's daughter" is Uma. We get: "Uma is my daughter's mother."

Imagine "my daughter" is Valerie. We get: "Uma is (my daughter) Valerie's mother."

The mystery "I" is one of Valerie's parents.
Valerie's parent could be: Uma, in which case her relationship to Teresa is "daughter."
Valerie's parent could be: Uma's husband, in which case his relationship to Teresa is "son-in-law."
Valerie's parent could be: Uma's wife, in which case her relationship to Teresa is "daughter-in-law."

Valerie's parent could be: Uma's boyfriend/girlfriend, in which case their relationship to Teresa is ???
Valerie's parent could be: Uma's ex, in which case their relationship to Teresa is ???

Valerie's parent could be: Valerie's birth mom, in which case their relationship to Teresa is ???