I was adopted by Aunt because we were gong to sent to and orphanage when I was 3 months, but saw my biological parents and family events or met them for a BBQ everynow and again. I hated it because you knew that smack in the head, being beaten with piece of electrical cord etc would come eventually. runk or not it didn't matter to my biollogcal parents
I gave my children just a small tap on the bottom and I always explained why. It was intended to get my child attention if words didn't work.
I feel a light smack, not with whole hand is ok its when household objects like the leather razor strop, electrial cords, wooden spoons etc are used thats when it becomes abuse along with smacking with a force that knocks a child down.