The timing of the deposit date and the statement cutoff date will determine how long you would have to wait before submitting your file to underwriting.The better way to do this would be to have your parents pay the cards directly so there is no deposit to document for your file.As far as life insurance is concerned - what Zach said!

However, with the quarantine lasting a month or more, it seems like it will be much harder for her to have enough active participation hours documented to be able to qualify.

If structured properly (and your documentable income can support it), you can finance up to 20 separate properties between you and your wife.2 - The maximum LTV for cash-out refinance is currently 80% on a single loan. 

An application, documentation that they were laid off,  evidence they applied for unemployment and perhaps the amount they are receiving. 

I'd dive deep into how to execute the mechanics of a seller carry note, find an attorney to draft the documents, a servicer to handle the regulatory requirements if she wants, ect. 

This is specific to FHA. https://www.hud.gov/sites/dfiles/OCHCO/documents/19-14hsgml.pdf(1) Eligibility for Disaster Loan ModificationThe Mortgagee must ensure that Borrowers and their FHA-insured Mortgagesmeet the following eligibility and term requirements for a Disaster LoanModification:• The Mortgage was current or less than 30 Days past due as of the dateof the applicable Disaster Declaration.• The Mortgagee confirms Borrower income is equal to or greater thanit was prior to the Disaster using a recent pay stub for income, W-2,bank statement or other documentation reflecting the amount ofincome.• As an alternative to providing income documentation, the Borrowercan complete a three month Trial Payment Plan (TPP), which willconfirm that their income has returned to pre-disaster levels.

I'm renting my house out soon, and want to make sure I have systems in place to save documents, hold security deposit, keep track of repairs, etc.

Both the seller and buyer (me) had the documents etc necessary for the close to happen.

In most areas, deposits are to be used at move out and for documented damage.

—Upon receiving a request for forbearance from a borrower under subsection (b), the servicer shall with no additional documentation required other than the borrower’s attestation to a financial hardship caused by the COVID–19 emergency and with no fees, penalties, or interest (beyond the amounts scheduled or calculated as if the borrower made all contractual payments on time and in full under the terms of the mortgage contract) charged to the borrower in connection with the forbearance, provide the forbearance for up to 180 days, which may be extended for an additional period of up to 180 days at the request of the borrower, provided that, the borrower’s request for an extension is made during the covered period, and, at the borrower’s request, either the initial or extended period of forbearance may be shortened. (2) FORECLOSURE MORATORIUM.