You will learn to live with them and they will learn to live with you.
You will figure out what they like and do your best and vice versa.
No girls comes fully programmed as the perfect wife and daughter in law, you learn with time and adjust according to the family and your husband...as do they.
Your job is to make the effort as much as you can to learn, adapt and just be nice. Eventually, they will forgive your shortcomings and even help you out.
On a side note, he is an only son. Living with his parents is a given and should not be a surprise to you at all. Eventually, this would have been his responsibility regardless of the location...UK or Pakistan.
I've been stressing myself and getting depressed over the same adjustment issue with in-laws and your words spoke soo directly to me and I feel so much better
Thanks :)