To me this makes sense because a one bedroom can host 1-2 people easily with a competitive ADR and cleaning fee, while 4+ beds can host multiple families and split up a higher ADR between more adults. 2 bedrooms can be price competitive with 1 bedrooms and attract the same guest avatar plus small families or 2 couples. 

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

I moved in with a good friend of mine and her adult daughter to their apt in Phoenix.

I haven't found an answer to this specific question on BP or elsewhere online: if I die, and my SDIRA that holds investment property goes to my adult child, what are his/her options? 

@Anthony VasquezIf you want to take that route, you're an adult that can make your own decisions. 

I read some post on BP where they were suggested to charge more rent for 3 adults, but if that's not okay I'll not do that . 

My 12 yr old sister was playing horseshoes with my father and 2 other adults. she was good at it.

I ran an adult foster care facility licensed for nine for a few years, and had a few thoughts at https://www.biggerpockets.com/forums/48/topics/1173808-what-...Take a look and see if anything there stokes your interest (or your concern :)

He had drained our joint bank accounts, changed his pension deposits to a new bank account, abandoned me and adult daughter.

i.e.) can 5 unrelated adults live in a 5-bedroom house?