Renting at Fair Market Value

I may be moving to my fiancés home.

If I do, I will rent three of my four bedrooms to my daughter & grandkids. 

One bedroom with private bath will always be available for me to visit, determine repairs to be made, etc.  

 

Fair Market Value is approximately $2050 for the entire home and property. 

If she’s paying $1550 plus all utilities for three of the four bedrooms, does this fall into the Fair Market Value range?