I have a mixed bag.
This is one of the few good points of my family. They are not overly intrusive about my relationship. I choose what I share, but I am more in that habit from guarding my innermost self from their potential ravages and mockery.
My in-laws, specifically my mother-in-law, are extremely intrusive. My husband is in the habit of basically telling them nothing about his life at all lest she devour it. Thus, we do not talk about our health. We do not talk about allow them to discuss children (or did not when childbearing was an issue).
The boundaries have had to be very firm there.
One time, she called while I was out of town on a business trip and my husband had come down with the flu. Unable to reach him the next day to check on him (he went to the ER for IV fluids, and then was sleeping), she had the police break a window and go into our home! My normally mild-mannered husband really went off on her for that.
Another time, they wrote him a letter offering to pay for a divorce and suggesting he come live with them instead. He didn’t speak to them for a year after writing a blistering letter back.
Physical distance is our friend.