This is all I sent him - ud.

...Hi
I got your e-card for 's', I will save it for his birthday.
Thank you,
T...

A bit formal but appreciative. And yes, I have reminded him for years when his son's bday is (2days be4 mine!) and he usually remembers the other kids'. but I realized last nite that he never spent ALL day trying to get in touch w/them.
Hmmmm?