Is this just a guess or is there an authority on this?

However, if I were that LL I would feel terrible.I think it is ironic that the Seattle public housing authority is exempt. 

If rental agreement is not signed by a permitted property manager, it "must contain a disclosure at the top of the first page of the agreement, in a font size at least two times larger than any other font size in the agreement, which states that: (a) There are rebuttable presumptions in NRS 205.0813 and 205.0817 that the tenant does not have lawful occupancy of the dwelling unless the agreement: (1) Is notarized or is signed by an authorized agent of the landlord who at the time of signing holds a permit to engage in property management pursuant to chapter 645 of NRS; and (2) Includes the current address and telephone number of the landlord or his or her authorized representative; and..."

Our entire lease packet includes: 1) The Lease; 2) 'House Rules' which are exactly that; they're a legal guide of what the Tenant may or may not due in/on a property and are reciprocated and compliment the lease and some of ours have sections which are specific to the property; 3) HOA agreement (if there is an HOA) pretty much saying that they are responsible for any fees in relation to any violations they carryout and their responsibility to notify us;4) Septic System Responsibility (if there is a Septic system), notifies them the schedule the septic system is on and that it will be prorated to the length of their stay, and also goes over a few prohibited items that should be used in a septic system5) Credit Reporting / Tenant Performance Authorization - it authorizes us and informs them that their payment history may be reported to credit bureaus and that we may also report to tenant performance to tenant monitoring agencies.   6) Settlement of Charges Guide - We openly let them know from the beginning what the average charges are for some common items such as patching drywall, replacing doors, windows, etc. 7) Lead disclosure form We typically sign most of our Leases online, it makes it easy on the Tenants and seems to be a bit more enforceable since it is traceable and creates an audit trail.

It deletes provisions authorizing the Commission to adopt regulations requiring the investigation of an applicant’s background.

In yesterdays newspaper I read that a county official is trying to get the 2020 census taken during the turnaround so that all the temporary workers here would be included in the population count. 

(b)Borrower shall furnish to Lender:(1)(i) except as provided in clause (ii) below, within 45 days after the end of each fiscal quarter of Borrower, a statement of income and expenses for Borrower's operation of the Mortgaged Property on a year-to-date basis as of the end of each fiscal quarter, (ii) within 120 days after the end of each fiscal year of Borrower, (A) a statement of income and expenses for Borrower's operation of the Mortgaged Property for such fiscal year, (B) a statement of changes in financial position of Borrower relating to the Mortgaged Property for such fiscal year, and (C) when requested by Lender, a balance sheet showing all assets and liabilities of Borrower relating to the Mortgaged Property as of the end of such fiscal year; and (iii) any of the foregoing at any other time upon Lender’s request;(2)(i) except as provided in clause (ii) below, within 45 days after the end of each fiscal quarter of Borrower, and (ii) within 120 days after the end of each fiscal year of Borrower, and at any other time upon Lender's request, a rent schedule for the Mortgaged Property showing the name of each tenant, and for each tenant, the space occupied, the lease expiration date, the rent payable for the current month, the date through which rent has been paid, and any related information requested by Lender;(3)within 120 days after the end of each fiscal year of Borrower, and at any other time upon Lender's request, an accounting of all security deposits held pursuant to all Leases, including the name of the institution (if any) and the names and identification numbers of the accounts (if any) in which such security deposits are held and the name of the person to contact at such financial institution, along with any authority or release necessary for Lender to access information regarding such accounts;(4)within 120 days after the end of each fiscal year of Borrower, and at any other time upon Lender's request, a statement that identifies all owners of any interest in Borrower and the interest held by each, if Borrower is a corporation, all officers and directors of Borrower, and if Borrower is a limited liability company, all managers who are not members;(5)upon Lender's request, a monthly property management report for the Mortgaged Property, showing the number of inquiries made and rental applications received from tenants or prospective tenants and deposits received from tenants and any other information requested by Lender;(6)upon Lender's request, a balance sheet, a statement of income and expenses for Borrower and a statement of changes in financial position of Borrower for Borrower's most recent fiscal year; and(7)if required by Lender, within 30 days of the end of each calendar month, a monthly statement of income and expenses for such calendar month on a year-to-date basis for Borrower's operation of the Mortgaged Property.

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What's the best way to officially swap homes/mortgages without going through the traditional buy/sell process?

It sounds like the daughter's boyfriend has moved in, and the dad wants to put him on the responsibility for the lease to make it more official, which seems very reasonable.