Srinagarindra Thailand Srinagarindra Sangwalya Mahidol Sangwal or Srinagarindra was the Princess Mother of Thailand. in Thon Buri died in Bangkok. Her formal name and title were Somdej Phra Srinagarindra Boromarajajonani In Thailand, the Princess Mother was affectionately called Somdet Ya the Royal Grand Mother and by the various hill tribe people, she was called Mae Fah