If I went this route I could charge it under my lease agreement as additional rent due immediately and charge 75 service fee.

The wife isn't the best communicator and refuses to sign the rental agreement.

Reach out to a lawyer to build the LLC and the partnership agreement.

My lender doesn’t seem sure about my question if my signed lease agreement supersedes the rental appraisal.

Go further down the page and read what happens if the son doesn't move in...Landlords should beware that when they end a tenancy, they must:Take steps to accomplish the stated purpose for ending the tenancy under section 49 within a reasonable period after the effective date of the notice, orUse the rental unit for that stated purpose for at least 6 months beginning within a reasonable period after the effective date of the notice,If they don't, they must compensate the tenant 12 months’ rent payable under the tenancy agreement.

This is even more important on the seller side with a listing agreement because of MLS regulations but it applies to buyer contracts too.

And the buyer ( me ) violating the agreement even if I go talk to the owners or whoever is affiliated with the property and do my basic due diligence, which as sellers are not willing to give a basic answer about the property but encouraging the buyer to do the research, however, I can't talk to anyone otherwise I'm in violation and they can keep my 10% of the contract value ???!

They may also require you to sign an agreement to have the home in the park and to follow their rules and regulations.

You have no idea if they paid rent since March 2020, if they have income, what prior agreements exist. 

Hello BP community, We are looking for a professional who will advise on how to set up investment properties ownership for a married couple without a Pre-Nuptial agreement.