I currently have a family of four renting a 3 bed 1 bath sfh from me (husband & wife with two small children) and they sent me the following message: “My wife and I are working on figuring out some new living arrangement possibilities for her father.

While I've heard gurus tout the benefits of such arrangements, I'm not sure how prevalent they are in practice.

I'd like to identify someone I can help out of a tough situation, that would be a mutually beneficial arrangement.

Its a "hockey" arrangement which is why you need to consult a professional or two.well... 

Are there any verbal agreements or arrangements between the current Landlord and Tenant?

No need for a TIC arrangement at all.4.

I have the down payment funds for the purchase, but was interested in bringing in a partner to improve my credit profile and get better rates.I can get the entity situation handled, but just trying to get feedback from others who may have created and work with partnership and arrangements Thx 

Keep in mind that under the BORSA arrangement, your new 401K actually owns the C-corp because it holds all the shares of stock, which seems to me more vulnerable to lawsuts than operating as a LLC.   

You should've already received the settlement statement (closing disclosure) and reviewed everything to make sure it looks right (you'd be surprised how many mistakes I've caught the day before and sometimes the day of closing) I dont think closing docs can be e-signed, you will need a mobile notary, but the title company should be arranging that for you. 

A wealthy friend of the family has an arrangement where he has been a passive investor partnering with a contractor/flipper for a few years now.My friend provides all the cash to buy the house.