When you have your own family, you need to be good upon her eye as good as you can be. You might have your parent and you seeing them like acting unfair upon either your sibling or you .
But, that's your story, be not to practice of what your parent taught if you felt it's just not right. Do not apply it on your child.
Be fair with your children.
Do not murmur to your child of what their grandparents have done to you.
It's not good for them. It just not right