Can my lender cancel my loan?

No, you should not worry this is normal. They should have asked before you closed. Your loan had funded and recorded, you own the house and they can't cancel your loan. They need to document where the funds came from so they can likely sell your loan. It is not your problem but if you can help them then that would be tube nice thing to do.

No, you should not worry this is normal. They should have asked before you closed. Your loan had funded and recorded, you own the house and they can't cancel your loan, this is on them. They need to document where the funds came from so they can likely sell your loan. It is not your problem but if you can help them then that would be the nice thing to do as most lenders sell loans in the background to Fannie Mae or Freddie Mac and this follows their guidelines. I am in California and happy to discuss with you if you want to call me at (707) 347-9250

In your closing paperwork, all borrower(s) should have signed at least one paper that stated you agree to comply with providing additional documents and anything that was missed during the signing of the closing papers as long as it applies to the loan. I also agree with the previous posted answer that a majority of lenders would not have let the loan get a clear to close without having a paper trail of all funds that was gifted to help with the closing costs. Where the funds are coming from and a completed gift letter stating all the necessary information about the gift.

They can't undo the loan. But clearly the closing company screwed up and closed a loan they were not supposed to, as you must always prove, document, and verify all monies used to purchase the home. For example if you only proved $10,000, and $10,001 was needed at closing, it should have never been allowed to close until you proved and documented the extra money. But be a good sport and assist the lender in correcting the file so they don't unnecessarily end up losing money with an un-sellable loans.