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Thanks everyone, I guess it's something I have to think about. I've never really liked his family, which consist of his dog obsessed mother, who sent my partner to boarding school at the age of five. The ridiculous thing is, the boarding school was literally around the corner from her house. I think that has messed him up to a degree.
As for the brother he is a pot smoking, free loading waster, who at 35 cannot hold down a job and see's my partner as an open cheque book. Even though we are having a child, his brother still expects handouts, including his mortgage payments.
I know I won't allow the baby to visit her home, as I wouldn't trust her dogs and I feel if anything did happen, she would be distraught, as her dogs would be put down. But I agree with some of the comments, maybe I need to put my own feelings aside and consider my baby may need a relationship with his Grandmother, as he unfortunately won't have my mum around.