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They will need to source it. How far back they go is up to the lender. Just as a heads up, it is not considered a loan. Refer to it as a gift.. because it has to be given with the understanding that you're not expected to pay it back.
Right. Never ever call it a loan, never mention it as a loan of you won't be able to use it. It has to be a gift with the understanding that you will not have to pay it back in the eyes of the lender. So whatever you have as a plan with your family, keep it to yourself. As far as the lender is concerned it is a gift.
And remember that if you do, in fact, pay back the money they gift you...you've technically committed mortgage fraud. So make sure your family is quiet about it as well.