A month post closing, the son of the buyer (mother) has written a "legal" request to have us buy him a new refrigerator.  

As long as you have written criteria, that you apply equally to all applicants, you should be fine. 

I am in discussions to seller finance a townhome-style quadplex.

What’s your communication style and preferred level of involvement with this deal?

It can be done, but don't assume "they will cash flow nicely".

Brandon Turner here on BP has written a few good books to help.Lessons Learned:  Never let your emotions get in the way. 

you can always call or email the tenant in regards to this matter. i personally smoke as well and just would want my tenants happy and not feeling accused as its a big problem with a lot of tenant v landlord situations around the country. you can always say you got a report of the odor of weed and was just verifying the smell with both tenants on the property. you can restate your conditions with smoking. you can always ask if they are legally able to do so as well (meaning medical card). depending on how you want to handle it, if you want to make it a legal warning to the tenant as well, you should write a written letter sent by mail stating you got a report of weed and this is a written warning in case this a problem down the road, you have evidence to show the court if it gets to that matter that this is not your first occurrence. best of luck!

If you have a written lease, this should be a straight forward matter to process the eviction.

Fortunately, the tenant paid for all of it.They lived in a building with a nice laundry facility (six washers and dryers) that were priced below what the laundromats charge.

I believe if something happens and the tenant only has it in their name I am unable to get the proceeds because the check will be written to them.