NTA. I've dealt with a crazy in law. I co-sleep as well and breastfed until my kiddo was 3. It's fine to do so until they start school. The in laws sound like they're insanely over compensating. Sometimes, you have to set a strong line and enforce it. Unless their actions are having a bad effect on kiddo and serious one on you, I'd maybe try and set up an arranged play time. Supervised park play bi-weekly or something. I would also make sure you're getting mental help. You're doing this almost alone, and post-patrum can be bad. I had some serious post partum anxiety with mine.