I grew up in a family (two brothers, one sister) where spanking was almost the only form of discipline. Mom and dad did not hesitate to tan one of our bottoms when we were out of line. They both shared in that duty until us girls reached puberty, then mom took over as exclusive disciplinarian of us. For some reason dad didn't feel comfortable taking down our underpants, and when we reached "womanhood" he stopped spanking us all together. Dad however, continued to discipline my brothers and he was a lot more harsh on them than mom was with us. He would sometimes use his belt on the boys. Mom on the other hand either used her hand or a paddle-ball paddle usually on our bare bottoms.
Mom always had a routine she followed when either of us girls were going to be spanked, whereas dad, before we reached puberty would just pull my sister and I over his lap after lowering our jeans or raising our dress and spanked the hell out of us over our panties.
My husband and his brother were also spanked as children, by both parents. His dad, like mine, sometimes used the belt on their bare backside. Also, his dad spanked his mom. My husband never saw those spankings, but he did hear them.