I really think the marriage counseling idea might help, if only to help them to learn a better way to discuss their disagreements. I dip hope they follow through. (((()))) any way you can all them to talk in the backyard or basement or somewhere they disrupts you less? I remember my parents used to always argue on the back deck...unfortunately my bedroom was right above the deck and the window was usually open. But maybe even them knowing that they need to relocate the discussion would be enough to calm them down