My two-year old ain't seeing his granddad.
Do you have a problem with your grandfather?
I don't like his attitude. He is so arrogant and he has some strange habits
I understand your reservations about your granddad. At the same time it's not ok to keep him from seeing his grandchildren. Trust me your kid and your grandfather will be so happy to spend time with each other.
I'm ok with keeping my kid out of seeing my granddad. It's for his own good.
Your feelings are very valid, but try to think about how your child would feel about not getting to know their grandpa. They could be missing out on many wonderful memories by not visiting them.