It's a cop-out. Put on your big girl panties and call to say "Hi Larla. I just wanted to let you know that we got a little spooked when you said you were interviewing with multiple families so we kept interviewing too, and we decided to offer the job to someone else. I wanted to let you know as soon as DH and I made the offer and had it accepted, so you can go forward with your other possibilities. It was great meeting you; we wish you the best of luck."
*Do NOT text this.