Responsible and loving, a great dad in every way, but he's your son and is it appropriate to send him a Fathers Day card? Fathers Day cards for your son are actually quite popular and common, because after all, Father's Day is about recognizing and honoring fathers all over. So go ahead and send your son a happy Father's day card and let him know how much you admire him as a father to his children. Your extra encouragement and admiration are extra-special because they come from someone who holds a special place in your son's heart, his parents. Whether you send a joint card with your spouse to your son or send them separately, it doesn't make a difference as long as you send him a Fathers Day card. Because whether you select a funny funny, appreciative, inspirational, moving, or downright sentimental Father's Day card receiving it will mean a lot to your son. Be sure to let him know all the ways in which you admire him as a father to your grandchildren, if he cooks dinner every night or makes sure that they understand the rules of soccer, these are important and healthy qualities for your grandchildren to have around them as they grow up.