I think hard money lenders will not care, but traditional lenders will see that as highly risky and will reject your application.

I have an applicant- Mr. 

Seems weird that they'd want to schedule time to see the house, but won't fill out application.

I just received 2 applications from prospective tenants.

My experience has beenthat, the person on the other end of the email sends me a very informal application, also require a origination fee.

Seller costs = can include realtor fees for seller and buyer's agents, attorney fees, transfer taxes, owner's title insurance, prorated property taxes and HOA fees if applicableBuyer costs = origination/processing fees to lender, escrow fees, prepaid taxes & insurance, appraisal, lender's title insurance, home inspection, survey fee (if applicable) prorated taxes and inspection fees.

Or, 2) provide an application for the mother, require it to be submitted, complete, within a day or two.

However, it is important to keep in mind that pre-approval is not a guarantee of financing, as final approval for a mortgage loan is based on an appraisal of the property and a review of your financial situation at the time of the loan application.

It differs with every jurisdiction and I wouldn't want to give you advice on what may not be applicable to where you live.

It's these people that are prone to being scammed cause they hear a million nos but then someone says "sure, let me send you an application" and they fall for it.