Obviously, you should talk to a mortgage professional. My personal experience is banks are very strict these days. They will look at your bank statement and ask where you get a $200 deposit from. So, if you have a $75k deposit, they’ll definitely ask. They won’t like it if you tell them you borrowed it. They would require a letter from your MIL saying that it’s a gift and not a loan. I think, they only ask for the last 2-3 bank statements, so if you let the money seasoned for >3 months, they might not know and might not ask.
