Uniindia: Hyderabad, Nov 23 (UNI) A grandson of the last Nizam Nawab Mir Osman Ali Khan, Nawab Najaf Ali Khan has approached the City Civil Court challenging the sole ownership claim of Mukarram Jah of the five royal palaces - Falaknuma Palace, King Kothi palace/ Nazri Bagh, ChowMahalla palace, Purani Haveli (all in Hyderabad) and Harewood and Cedars Bunglow in Ooty (Tamil Naidu).