This. It sends a precedent that the craziest person wins. So basically if you guys ever had kids, would it be okay to use them as ammo to get what you want? Then your DH and all the kids would really be in the middle. I would request for DH to just get an hour with the kid alone (which neither you nor MIL will be there for), not at the mother's house unless his whole family (including you) is there. Otherwise wait until the custody agreements are final before jumping into this stuff.

I dealt with this too--but DH had my back. I felt like with MIL and her exclusionary tactics, she did what she did because she felt like I was the reasonable one, and the reasonable one is the one that gets trampled on and taken advantage of. When she realized that DH was vindictive enough to restrict access to OUR kids she changed her tune real quick. She only understood it in terms of who had what she want, and was only willing to behave to make sure she got what she wanted. Otherwise she'd throw whoever she wanted under the bus to appease the craziest person. DH just had to outcrazy everybody else.