I have a sister two years older and one two years younger.
My father spanked both myself and my sisters regularly while we were younger up to about 12 years old.
But both my sisters spankings carried on until they were much older. I remember my older sister still getting spanked not when she had had left to go to school but when she was at work.
Dad used to walk he up the room go in the room and shut the door. He was holding either his slipper or a hair brush. But I could hear the spanking from my room next door. And if i was careful I no one was around (particularly my mother) I could see a little bit through the keyhole. He was sitting on her bed spanking her knickers over his knee. Then when he left he would lock her door. I would look again and see her lying on her bed.
Anyone remember their father spanking their sisters or other girls spanked from that period.