Here we will see Section 5 of The Hindu Succession Act.
Act not to apply to certain properties.― This Act shall not apply to―
(i) any property succession to which is regulated by the Indian Succession Act, 1925 ( 39 of 1925), by reason of the provisions contained in section 21 of the Special Marriage Act, 1954 (43 of 1954);
(ii) any estate which descends to a single heir by the terms of any covenant or agreement entered into by the Ruler of any Indian State with the Government of India or by the terms of any enactment passed before the commencement of this Act;
(iii) the Valiamma Thampuran Kovilagam Estate and the Palace Fund administered by the Palace Administration Board by reason of the powers conferred by Proclamation (IX of 1124) dated 29th June, 1949, promulgated by the Maharaja of Cochin.