My mother was a very good cook, and so was my father ( who mostly took over the cooking after he retired). One year, my mother was not feeling well, she was starting to get older. My father was worried about her, so he did not feel much like cooking either. It was close to X-mas. That's when I took over the cooking. After that, it just continued, for holidays, birthdays, etc. Usually, I bring the whole dinner to their place. That way they still feel like they are inviting us over...They set up the table, buy the wines, etc. If I don't have the time to prepare the whole meal, I make a few desserts, specially for birthdays, when it falls on a weekdays. If they would be younger, I don't think they would let me prepare the meals...