After selecting the perfect card for your own mother, it is then time to turn your mind towards finding a card suitable for your mother in law. Mothers Day cards for a mother in law are tricky because whether your mother in law is a monster in law or the most amazing angel on earth you should always give her a Mothers Day card. Your mother in law is sure to appreciate the thoughtfulness, especially if your spouse is forgetful or late when it comes to remembering holidays. Even if your mother in law does not appreciate your Mothers Day card or is difficult for you to get along with it is still vitally important to attempt civility and give her nothing to complain about to her friends (or to you) by sending her a sweet Mother's Day card. If you truly cannot think of anything to say to her then simply write a tiny note that says, "Happy Mothers Day" and sign your names. If your mother in law is an angel then you are very lucky and your Mother's Day card should have a significantly longer note to express your love for them on their special day.