Live Long and Prosper
I guess I'm weird but one of the first things I taught my kids, when they were old enough, was our names, address and phone number. My oldest got it right away and the youngest had most of it, at least I was more than "Mommy" to him. Even at kindergarten age, they should know their mama and daddy's name and their address.some of the children were so young that they did not know their parents' names, replying "Mama" when asked.
But they could have just been that traumatized, I don't wanna sound like I'm being holier than thou, cause I'm definitely not.