I tend to go with the first family that meets my criteria in the sense that when I interview I let them know that it is based on first family back with form and deposit. I just continue to interview till I have the space filled. If I interview a family I am not happy with then I either tell them right up front sorry this won't work or let them go or tell them that I am conducting other interviews in the next two weeks and will let them know at the end of the two weeks the status of the space and for them to let me know what their preference is ie hoping I have a space still or going with someone else. And then at the end of the time take one of the other families instead and let the others know sorry.