Why was Philip especially close to his sister Elizabeth of Saxony?

Philip, Landgrave of Hesse, experienced a difficult and lonely youth following the early death of his father and a strained relationship with his mother, Duchess Anna of Mecklenburg. As a victim of political circumstances, he found emotional support and stability by increasingly attaching himself to his older sister, Elizabeth of Saxony. This bond became the most significant relationship of his life, and he remained closer to her than to anyone else throughout his adulthood.1