Who did Mozart and his sister play when he was 7?

he didnt marry but stated so..

On his 1762 visit to Schonbrunn, the Austrian royal palace, Mozart, playing with the young princesses, slipped on a polished floor. Bursting into tears, he was picked up and comforted by a seven-year-old Marie Antoinette. Mozart then kissed the future queen of France: "You are nice," he declared. "I will marry you."

but Mozart married Constanze Weber, the younger sister of his first love, Aloysia, who had turned him down.