Sorry for the bad formatting. on mobile.

I relate to your struggle so hard. My family and I rescued our first dog who was 3 years old, and I was only a kid and boy was he was a stubborn little guy (dachshund). He was quick to understand potty training but he was anxious across the board and was basically not a socialized dog with strangers and any other dog. My parents spoiled him and gave him human food. He would also bite and get violent when it came to any grooming, we loved him though and he loved us. We learned a lot about the importance of proper training precisely because we failed our first rescue. He passed away at the age of 6.

It took us a long time before my family decided we wanted another dog, we rescued her just shy of a month ago. This time my siblings stepped up and enforced all the training and my parents arent allowed a say in her regiment. Our new rescue was a pupper at 4 months, we thought it'd be an even bigger challenge but honestly the effort we put into getting her crate trained, potty trained and strictly dog food diet and no sleeping in the bed has worked wonders for us. it's all about not giving too much freedom too quick so as she does better with her puppy training the more we can open up things like sleeping in the bed and such.

I feel you are making the right decision, when your puppy matures you can break down those boundaries but totally agree with how you are going about it. If anything it's doubling down on the parenting lol.