Hi Disha, I have 9 year old nephew and whenever he asks me to tell him a story I use ‘The English Story: Best Short Stories for Kids’! You can find this application easily on Play Store, it's completely free of cost.
It provides you 2500+ short English stories for kids along with 12 different categories to choose from like ‘Tenali Raman, Akbar Birbal, Funny Stories, Inspirational Stories, and lot more’.
Hope it will help you! Have a great day! :)