They are married with kids (bother’s kids are already adults but stressed in his business), and just because I’m single, I get all the joy of living with my father 😣.

Adults with less than $10,000 in wealth make up 64 percent of the world's population but hold less than 2 percent of global wealth. 

Will she be the only adult living in the home?  

The seller's adult son (who lives in the house with mom) wants verbiage in my purchase contract allowing him to purchase the home from us.

I have two disabled adult sons who get some nursing care.

Sometimes the local school district will have an "adult education" program that has relevant classes - this is more likely if the district still has a vocational-technical school. 

Average Joe earning $50K per year and investing $20K per year has an extremely high probability (risk) of spending most of his adult life spinning his wheels in the rat race if he invests in real estate without leverage and spends several years accumulating cash such that he can invest in one giant lump.

Maybe you could have a parent on your team to do the things that only adults can do, like signing contracts.

It's a risk - not only for kids but for adults too - so your plan is where I would start and add in the safety measures described in the article.https://www.esurance.com/info/homeowners/what-is-an-attractive-nuisanceHope this helps...

Tells me he is going to use the house for his Adult family home business.My plan is to sell the note in 6 months.Question- will my note buyer like this situation?