Here is the puzzle:

If Teresa's daughter is my daughter's mother,
What am I to Teresa?

Find puzzle here

  • $\begingroup$ This question has appeared on many sites before and you should credit the original to avoid plagiarism. $\endgroup$ – Techidiot Jan 20 '17 at 10:00
  • $\begingroup$ @QaisarSatti it is probably not a duplicate on this website per say. Techidiot only meant that this is a well known puzzle which deserve some references. Unless you want to claim you made that puzzle yourself. $\endgroup$ – stack reader Jan 20 '17 at 10:06

The only 100% correct answer I can think of is

You are the parent of her grand child.


Son in law assume that you are married. Which you might not be.
It is also possible that you are simply Teresa's daughter. Why not.

  • $\begingroup$ It is also possible that you are simply Teresa's daughter how? $\endgroup$ – Qaisar Satti Jan 20 '17 at 9:56
  • 1
    $\begingroup$ @QaisarSatti "My daughter's mother" can be describing the mother herself. $\endgroup$ – stack reader Jan 20 '17 at 10:00

You are

Teressa's Daughter


"Teresa's daughter is my daughter's mother"
my daughter's mother is actually me (i.e. the person who is asking the puzzle).


Teresa's daughter is me (i.e. the person who is asking the puzzle is Teresa's daughter).
Note: As there are only females available for the answer, the answer cannot be a male.


Another simpler explanation

Teresa - > Daugter -> X -> is My Daugter's Mother -> Me

Hence X = Me
Hence, I am Teresa's Daughter

  • $\begingroup$ In your source, only females are available. But not in OP's questions. so the father is also viable. $\endgroup$ – stack reader Jan 20 '17 at 10:03
  • $\begingroup$ @stackreader That's right but it's a valid answer as well :) $\endgroup$ – Techidiot Jan 20 '17 at 10:07

You are Teresa's

Son in law


your wife is Teresa's daughter


You are:

Her son-in-law. Her daughter, your wife, is the mother of YOUR daughter.


There are are only two solution-answers to this puzzle.


I am married to Teresa's daughter then I am the son-in-law of Teresa. If I was ever married and I am no more I am an ex-son-in-law.


I had my daughter out of wedlock, then Teresa is simply my daughter's maternal grandmother.


You are

Teresa's SON in LAW, because your wife is Teresa's daughter.


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