Grandparents rights

Do you think grandparent's have "rights" if you do what are they?

My husband's parents are manipulative and he went thru a lot of abuse as a child and teenager from his father. His mother was not completely oblivious to the situation but was not abused either. She had her own job, money, car ect. She was more like "sweep it under the rug" so know one knows or thinks differently of them. My husband says that he still wants his parents to be able to see our kids usually at our house or public place. Me on the other hand I feel like they don't deserve too. He actually has a fine relationship with them espically his mom, he thinks she's a saint. And that's again where I don't get it and if I was him would have no contact with them or even know that I existed! Sorry so long rant over!