The new homes it shows up under commands, and you can do it for anyone in game when you are in your home. However I happen to know you have one of the older ones from the fund raisers so you need to do like Jandar had to do:
Had to be standing outside the house, then MAKE MY GUEST <person's name> I don't remember for certain but think you have to use first and last name but that is the command- I saved it in my notes since I forgot it from last time I used it and had a heck of a time finding someone that remembered how.