NO... my parents would not smack my children simply because the last time i was smacked as a child, i smacked my mother back. so they know not to touch my children or they will cop it back... yes hipocritical i know..
PILs are not the type that would smack their grandchildren... the have so much patience its incredible... but my dh was belted with many wooden spoons in his childhood.

as for other relies... no way... im big on the kids being told of in a growly voice other then mum works wonders....