And maybe use a renewal as an opportunity to amend the lease to include payment terms like mine.

@Ray Loveless You can do an amendment to the current lease, adding the brother. 

Amendments to the IRC adopted by local jurisdictions may add to those requirements.If it is not obvious whether a room in your listing counts as a bedroom, the IRC and other codes mentioned here can help you resolve the question.Your local building official is a good source of information on local codes and amendments to the IRC.Misrepresenting the status of a room in the MLS could put you at risk of violating the MLS’s rules, Article 2 the Code of Ethics, which states that REALTORS® must avoid exaggerating or misrepresenting facts related to the property, and TREC Rule 535.155(d), which states an advertisement could mislead or deceive the public if it is inaccurate in any material fact or representation.The IRC requires a bedroom to have: A floor area of not less than 70 square feet and not less than 7 feet in any horizontal dimensionA minimum ceiling height of 7 feet, and if there is a sloped ceiling, then a minimum of 50% of ceiling must be a minimum of 7 feet highAt least one operable emergency escape and rescue opening with a clear opening of not less than 5.7 square feet, and a required egress window that must have a minimum width of 20 inches, a minimum height of 24 inches, and a maximum window sill height of 44 inches.Housing built prior to the adoption of the IRC by Texas that remains unchanged is not required to comply with IRC standards for what may be considered a bedroom.

So  the new tenant should buy out the existing tenant for the deposit if needed, not your issue.We do amendments to the existing lease when someone is leaving or when someone is being added as an authorized occupant, but do new paperwork when there is a new tenant. 

It also helps your borrower with his or her cash management – the lifeblood of any flip.You would have to amend your note but it would take some pressure off your borrower, reduce your angst, and increase your return.

After further thought we would like to file an amendment with the town. 

If he signed the lease then all parties would need to sign a lease amendment releasing him from the lease.  

There was a law passed during the Obama presidency called Protecting Tenants At Foreclosure that covers this; it was amended as well, so you will want to look at the amendments because they clarify some issues. 

Typically, I just write offers in my name and get escrow to do a "courtesy amendment" transferring the property to the entity of my choice.Most of it don't take issues with it, they ask my operating agreement though.

You can't unilaterally amend the security instrument.