It was John Jr.???s third birthday.A Daughter???s Tribute to Her MotherIf ???the mother???s heart is the child???s schoolroom,??? [then] our mother is the finest teacher we ever had,??? recalls Eunice Kennedy Shriver, the third Kennedy daughter. ???She did everything nine times for the five girls and four boys in our family, and she made our home a school-room that far surpassed any formal classro