Advice on dealing with addiction

Both my parents have been alcoholics for as long as I can remember, I’ve always tried to judge them a little less and understand their struggle but I’m now having my first child and I’m so worried about them being involved. They aren’t aloud unsupervised contact with their younger children and I’ve decided this would be in my child’s interest too. I just don’t know if I would be making the wrong move in telling them I would rather they had no contact with my child, they aren’t the greatest parents and I understand they try but little things like disrespecting my other half just because they feel like it, my fathers forever telling people how unhappy he is I’m having my first baby with my partner! They’ve even bought my crib as they ‘want’ help but then use it against me like we bought you this but nobody else seems to have spent anything??? Firstly we’ve never asked this is the first grandchild/great grandchild on either families so she is a very spoiled baby and isn’t even out womb yet! I guess I’m just looking for advice I told them to send anything they bought my daughter back and get a refund but I just don’t want to seem unnecessarily ungrateful I’m just so fed up of them throwing it at me like I asked them to do anything. And just to confirm my partner and I both work very hard and are both adults.