Ouch. I feel your pain from that situation! During a career change, we lived with my in-laws for a couple months. During that time the idea was floated to have my father-in-law invest in the business I was starting. He's an accountant by trade...and I hate accounting. I couldn't get the spreadsheets to lineup the way he was used to seeing and I made a comment that I immediately regretted. He recognized the comment for what it was (frustration, inexperience, etc.) and opened up a dialogue that helped us see eye to eye better. I'm forever grateful for that patient, understanding man!