I say it all the time to my bro's and rents...
The very little bit of family I have in the area here I've gotten really close to since moving here and say it to them too, and one of my cuz's that is basically the sister I never had. Aside from that it's not a term anyone'll hear me use when referring to people.
I say it to my Mom and my brother all the time
I heard Nomad say it to his brother over the phone myself

My mom = whenever I speak with her (once or twice a month by phone)
My Dad = barely ever (kinda strange and awkward for some reason)
My wife = quite a bit (not as much as I should)
My kids = several times every damn day
PBurke = 365 times on Friday night....hold's him over until next year for an average of once a day