There is mental illness and/or drugs involved. 

She continued to write in the email that the noise of the construction is causing her stress, all this is affecting her mental health. 

My daughter is a graduate student at Ohio University.

On top of this, lately I have noticed her 20 something year old daughter around quite a bit and have been having some suspicions about where she is living. 

sorry i took so long to respond, i was taking care of my baby grand daughter the last few days. 

In return once the property sells, she would get the loan amount back + 20% of the profits.My siblings and cousin(her daughter) would like to start an investment company.

Some mom and daughter lawyers are handling these sisters case and are trying to sell they're properties so they're acting as the real estate agents. 

My husband and I are in the process of purchasing a home for cash, and my daughter (who has pre-qualified for a loan) wants to live in the home and take out a loan to pay for it.

Ideally, the house should be a mother/daughter type with a lower apartment for rent. 

@Manolo D. it seems this is hitting close to home, of course I wouldn't want anyone to starve to death or take advantage of anyone, it's a question to see if this type of partnership is possible or if it's even a good idea, as a partner I would want to have a partner that is as committed as me so we can both make money, I know a lot of contractors have different projects going on so they can keep busy and not find themselves without work, but everyone has a bit different situation and mentality, what might not work for you might work for someone else.