Hi, I'm new to this but need advice. My parents have given me and my brother a substantial cash gift.A gift letter is an important, formal, legal piece of documentation that can help explain that a (usually rather large) sum of money was gifted to you. A gift letter is a piece of legal, written correspondence explicitly stating that money received isn't expected to be repaid. This document serves as proof that the money was genuinely intended as a gift. Components of a Gift Affidavit. Could someone please give this the once over? My parents gifted us 24,000GBP to help us meet the financial requirements for the spouse visa. "Streamline your mortgage process using our customizable Gift Letter for Mortgage template. Here's a sample gift letter you can use to prove that the money is truly meant as an outright gift, with no expectation of repayment.