I would aim for a house with a basement apartment or mother in law. 

My wife is a nurse and we have friends that are traveling nurses.

@Phat Dao A good use of that extra space we’re you were thinking of adding that gauge could be adding a ADU(guest house or mother-in-law sweet) that will add $500-$1,000/m (depending on the local market) that is my go to to add value to a home if there is extra area to build.

Mother in law unit, adu, detached garage/shed, split level, basements are all examples of ways to do this.

If that doesn't appeal to you, you can have some of my 2022 wall calendars suitable for a public school, church, office or nursing home.

You could AirBnb the house if the local jurisdiction allows short term rentals You could rent it out to travel nurses for at least 1 month at a time, which is considered a "mid term rental" and doesn't fall under the same restrictions as short term rentals, so if your area does restrict short term rentals (STRs), this can be a great options!

Increasing Square footage adding a room/bathroom converting garage into a bedroom adding an ADU or mother in law suite. 

Ask your mother and Father what they want done about the house--he has been living there free for a reason--maybe they will just deed it over to him.Maybe they like him more than you--or maybe he's the kind of person that needs more help than you (in your parents estimation).He has been living there free and clear for a long time.Here's an odd thought--maybe you were adopted and don't know it (seriously).Somehow he received a free house and you did not.Also you might want to look into living trusts (done by an attorney). 

She remains on oxygen and has nurses coming to help care for her.  

Purchase price: $400,000 First property and deal – scored an off-market SFH with a mother-in-law duplex.