Explore my personal favorites, Set For Life by Scott Trench or The Total Money Makeover by Dave Ramsey, for invaluable financial insights.3.

If it pays for itself, it provides you with a "free" place to live during the off-season.

Usually living in it for a few years may be enough for it to cash flow positive when you move out.  

I lived well below my means, worked a full time job for years while doing this on the side, persisted when others did not... and now I am enjoying the fruits of my labor.  

To set the scene: A cost seg study breaks your property into two important categories:1250 "real" property aka the building, foundation and other long life assets.1245 property aka anything that can be accelerated such as 5, 7, or 15 year property like carpets, cabinets, or other site improvements.

I'm a Realtor with a couple properties listed in Boise, ID and a neighboring town for my investor/client that are currently rented as co-living or rent-by-the-room and getting killer income. (7.3% - 9.5% Cap rate) So far, every inquiry has been baffled by the concept of co-living or rent-by-the-room and immediately ask if they're being run as a halfway-house (which they are not).

If not, do you own the primary home you're living in now? 

You don't want to lose your rate on the house you are living in now unless you want to sell it so since that is an owner-occupied, you need to stay there and save up the 20 percent for the second property based on what you said.

I have spent the last few years working in the Pre-Fab ADU space and now working with a company called Live Near Friends and help people buy real estate with the purpose of living closer to the people they care about. 

You all must agree to the same thing or else you will just end up fighting about what to do.Since your mom doesn't have it in a living trust, I suggest you do that right away.