Anyone who thinks that Mother's Day is a relaxing holiday for moms never had any kids. Your sister is one of the best moms you know, so send her this funny Mother's Day card to add some humor to her day. You both love your nieces and nephews, but Mother's Day can be a bit chaotic. With this Mother's Day card, you can make your sister laugh and remind her that nothing is more relaxing than a glass of her favorite wine.