According to Google maps, I am currently 928 +/- (all Denver Metro area) miles from my family, 679 miles from my nearest stepkid, 1339 from my farthest (is that even a word? It looks wrong) stepkid, and 1159 miles away from my in-laws. For us, that’s closer than usual. 
(eta I think I screwed up the math on the average)
My parents are 141km away. My sister is 1127km from them (1139 from me), and my brother currently lives in the same house, and when he moves it will likely be in the same city as them, or the next one over.
My husband’s parents are approx 100km from us (I don’t know the address to their new house yet), and he has no siblings.
I live 80 km (50 miles) away from my mum.
My brother lives a little further - 7000 km (4330 miles) away.
My parents: 20 miles as the crow flies, but it’s a 50+ mile drive. They’re 3 valleys over.
My sister: 40 miles
My wife’s Mom: 5 miles
Wife’s siblings: 10 miles
My wife’s mother lives about 200 yards from our house; my father lives in the same town (our other parents are both dead).
Our oldest son, his wife and their daughter live in Cary, NC (outside of Raleigh) while our youngest son and his wife live in Hawaii (although Son #2 has been posted to Bahrain for six months, which is even further away). We drove back to North Carolina once, three years ago. Now it’s cheaper to fly, but I’d like to drive it again sometime.
I’m about 3 miles away from my mom and mybrother is about 10 miles from her.
I’m about 1353 miles away from my dad and my brother is that plus an extra 14 miles or so.
I’m only about 1900 miles away from my parents now. (VT to CO) They used to be in WA, or 3115 miles away. My brother is 300 miles away, in NYC.
Never mind…
Mom’s in Tucson.
I’m 1839 miles away from her by car.
My brother is 1611 miles from her by car, in a different direction.
My sister is 8 miles away from her.
Average: 1153 miles or so.
She does tend to screw up the average, doesn’t she?
Parents: seven time zones from me
Brother :six time zones
There are also cousins in Singapore and South Africa.
We’re pretty dispersed.
I live 63 miles from my parents.
My brother lives 5 miles from parents. My other brother lives 5.00000009 miles from my parents (my brothers live next door to each other).