Don't cosher up your child.

不要娇惯你的孩子。

Cosher up your son and he will disappoint you in the future.

如果你溺爱儿子，他将来是会让你失望的。

I have understood that it is reasonable for grandpa and grandma love their grand sons by stories, but cosher is not so good.

通过故事我明白祖父母疼爱子孙，是合理的，但是溺爱了就不好了。