Hi there!

Feliway can be found at pet stores and a number of other places; I've gotten it from PetSmart, my vet's office, and Amazon.com!

It's very safe, and though our cats seem to be able to smell it, we people have never been able to! It's totally harmless as far as your son is concerned -- no "fumes" or anything else disagreeable.

Catty1 gave me a fantastic suggestion about using the Feliway spray on a stretchy collar; you just spray a little on each day, and it goes where the cat goes (instead of having to worry about which particular areas to spray, or using the diffuser).

Best of luck!