I only caught the last part of this episode, but it's where raymond, his wife, his brother, and his fiance, and raymond's parents are sitting at the table celebrating raymond's brother's engagement (I think) and the mother gives the speech about how to keep a marriage together. Any ideas?
This episode was called "Misery Loves Company". They are at Robert and Amy's house where they are all celebrating their 90 day wedding anniversary, and Amy keeps trying to give them all marriage advice. This, of course, sets Marie off on a lecture on how to have a lasting, good marriage.