When was the last time you told your parents how grateful you are just for being their children? When was the last time you told your parents how sorry you are for the troubles you have caused in the past? When was the last time you bought a present for your parents outside their birthday? When was the last time you were on your way home with the thought of seeing your parents?
Remember, your parents did all this for you, long before you could say a word. They did it, not because they had to, but because they loved you and they will keep doing it forever. For them, loving you is like breathing, how can they stop?