Hello Dr, I Have A Couple Questions About Applecidar Vinegar.

hello Dr, I have a couple questions about applecidar vinegar. sorry, forgot how to spell it..lol Anyways, my husband learned years ago that it was good for acid reflux so he has been drinking it for years. My great nephew learned at school that it actually was bad on the bones and makes it rubbery over long time. My mother-in-law, when she use to live on a farm, her family would make the salad dressing with applecidar vinegar and ate it for years. So, is it healthy? Is it bad on the body? any long term effects/ And last but least is white vinegar good or bad?