Your son, grandkids and I are always competing to decide who loves you the most. Your son says he loves you the most because you are his father

Your son, grandkids and I are always competing to decide who loves you the most. Your son says he loves you the most because you are his father. Your grandkids say that they love you the most because you are their loving grandpa. But I argue that I love you the most because you are my friend and father-in-law. Happy birthday.