My generation is the old-timers group in our family, and my sisters and I hug and kind of "air-kiss" - we're cheek to cheek and make kissy sounds. We all four do the same thing to each other's spouse and children and if we have them, grands and great-grands. The cousins also hug and air-kiss each other. We're all very close and I think a lot of it has to do with the fact that we lived so far apart for so many years after we married and left home. Sis#1 and Sis#3 stayed pretty close together, but Sis#2 joined the Navy, married a sailor and followed him from port to port, and I joined DH in the Foreign Service and we lived overseas for 17 years. The times we all got together were few and far between, so we were all happy to see each other. The same applies now, except Sis#2 Sis#3 live together in Maryland and Sis#1 lives in West Virginia. I'm still the far-away one, living in Florida.
DH's family is not much into hugging and kissing, except my two sisters-in-law and I do it. The distance is one factor in our actions, but we were friends long before DH and I became a couple, so our affection is multi-layered. My MIL is 87 years old, and I can still feel her body stiffen when I attempt to hug her (which I don't do often). She's loosened up a little over the years, but DH and I have been a couple for 54 years and she said "I love you" to me for the first time last summer.
Queen Colleen