Queen Sri Savarindira, the Queen Aunt, later titled the "Queen Grandmother", consulted with her daughter, Princess Valaya Alongkorn, the Princess of Petchaburi and her adopted son, Prince Rangsit Prayursakdi, the Prince of Chainat, about the suitable course of action for her grandchildren, especially Prince Ananda Mahidol. Prince Rangsit recommended Lausanne, Switzerland, a decision that Mom Sangwan approved due to its mild climate, scenery, and hospitable people. It was also said to be one of the most favoured places of her much-travelled husband Prince Mahidol. In April 1933, Mom Sangwan and her children left for Switzerland, together with a small entourage among whom was a young relative named Boonruen Sopoj, who later became Dame (Thanpuying) Boonruen Choonhavan, the widow of Prime Minister General Chatichai Choonhavan.