Question

Is it normal for big sisters to give wedgies to little brothers?

Answer 1

Normal or not is depended on the intent.

A ton of Big sisters all across the world often give the little brother wedgies in order to play around and have fun. Just like animals who are biting each other but never meant to hurt each other.
If the intention is to publicly humiliate the little brother, then it falls under 'abnormal' category.

Answer 2

Answer: sometimes

Explanation:

If it has happended to you, Dont worry, it is normal. Sibilings do this to each other as a form of teasing and a way to make you humiliated.