do you know what the cat's native tongue was?

Yes, the book Living With the Lama is "by Mrs Fifi Greywhiskers, P.S.C. / translated from the Siamese Cat language by / T. Lobsang Rampa." Copyright 1964.

From chapter one: "Mother-to-Be was shrieking her head off. 'I want a Tom' she yelled, 'A nice STRONG Tom!' The noise, the People said, was TERRIBLE. But then, Mother was renowned for her loud calling voice. At her insistent demand, all the best catteries in Paris were combed for a suitable Siamese Tom with the necessary degree. Shriller and louder grew Mother-to-Be's voice. More and more distraught grew the People as they turned with renewed strength to the search."

When I found my copy of the book, what was next to it on the shelf but: Pussy Willow by Mama San Ra-ab Rampa: "the wife of T. Lobsang Rampa tells an enchanting story of life with a famous author ... and the cats which ruled their household."