step in and allow your parents more access to your child. in order to foster a close relationship with grandparents there needs to be an opportunity to develop a close relationship. if your wife intentionally keeps your parents at bay there will be little chance for a close relationship to develop.
is your wife always so dramatic and negative? this is not normal. in most families new babies are a source of excitement and the more babies, the more excitement. don't let your wife's problem become everyone's problem. you need to step in and do something.
next time your wife tries to put the the brakes on your parents....pack those babies up,..... 