Two parents, an older sister (5 years older), and older brother (6 years older). I played with friends and neighborhood kids, they played with each other. Sister and I hated each other. Get along fine once she left for college.

Dad was in PhD program for most of my younger years. I think it took him 7 years to complete his dissertation. Then he started teaching. Brother & sister were both out in college by the time I entered 5th grade, so a good part of middle/teen years were spent as "only child," which was fine with me. Mom went back to school when they left for college, then got a job by the time I went to high school, so I really didn't have to worry about my parents too much by then. I worked and kept my own schedule anyway. The only real rule is that if I was going to be out much beyond 10:00 I had to let them know.
We did LOTS of family stuff when my sister and brother were still around. We were the kind of family that played board games, went on picnics, picked apples in the fall, cut our own Christmas trees, went camping in the summer...
Both sets of grandparents were alive. They lived in PA, we were in suburb of Chicago. Every Thanksgiving/Christmas we traded off them coming to IL or us going there. LOVED taking the train with the dog to PA every other year!

Spent a month every summer at the grandparents - two weeks with one set, two weeks with the other. My mom's parents were farmers and I LOVED spending August on the farm.

(Grandpa raised chickens and sheep for breeding, and won heaps of awards for his animals. The State Fair was always when we were there, and we used to help prep the animals, get them to the show, were there for the judging... SO much fun!)
Pets:
A Irish Setter-Something mutt, Pavie (Pavlova), until I was about 4, then a Welsh Terrier, Kyffin, who was put to sleep when I was in college.

A goldfish I won at a little fair when I was in grade school died while I was in college.

Gerbils when I was in grade school for a few years.
My room:
We lived in a little house. Everyone called it "The Hobbit House."

There were three bedrooms on the 2nd floor with the sloping roof you had to be careful not to bang your head on in numerous places. We never had doors on our rooms, though we kids were upstairs. We just tacked up curtains over the door frames.
Had one bathroom for all of us on the first floor, and no shower, only a tub. LOVED that giant cast-iron claw foot tub!
I painted my room in 4th grade - the bottom half sunny yellow, top white. Put up bookshelves. Dad oversaw me using the electric saw. Sanded and stained them myselves. Put up brackets to hang the shelves. I LOVED reading. My sister wound up with all my childhood books. I guess most were hers first.
In high school I moved into what had been my brother's room. There was a little roof that jutted out under one of the windows, and it was super easy to get in and out of the house from his room.

From my old room I needed a ladder. From his it was easy to get up/down from the fence at the edge of the property.