Definitely my Mother's side of the family.
My Mom was one of 7 children so I had lots of Aunts, Uncles and Cousins. Her Mother was one of 13 so there was also a very large extended family as well. Going to family gatherings was a major event and I had lots of Cousins my age to hang out and play with. This was also the Mexican side of the family so the food was great and plentiful, though I never really learned to appreciate the mariachi music.
My Dad's side of the family was much smaller. He was the one of three brothers, his Mother had one sibling, a sister, and his Father had siblings whom we never met. So it was a much smaller family, plus my Dad was the oldest brother so when I was born I was the only grandchild for several years. When there was finally a cousin I could play with he didn't really have much in common with me. Unfortunately he also turned out to not have very much in common with my Uncle who discovered that his Son wasn't really his, it was awkward. I never saw that "cousin" ever again and the next cousins to come along were all girls about my youngest sister's age. This was also the wealthy European side of the family, very snooty and WASP-y. They were my introduction to the phrase "Children should be seen and not heard". I had heard that it was a bit of a scandal in the Country Club when my Dad got married to a Mexican woman, but I was never at that club so can't say for sure.
The notable exceptions from that side was my Grandmother, who taught me to play cards, and her Brother in Law, who was a judge with a tough reputation but always treated me with the respect he showed any other adult even though I wasn't. He would play chess with me, discuss politics, history and literature and never once "dumbed down" the conversation even when I was 8 or 9. To this day it's a pet peeve of mine to hear adults using that "I'm talking to a little kid" lilt and tone.