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@Terry53029 wrote:

It seems to me the daughter is just giving the parents a thank you gift for letting her use the families personal vacation home.

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That is not what the OP said.  The OP said she is paying $1000 in rent to live in the home.

And a Gift is a no-strings-attached thing.  It seems like the parents are expecting the $1000 a month, and if she quit paying, the parents would question her on it.  That would NOT be a Gift.