Your brother always wants to play with his mobile phone, but he doesn't give it to him. He also called you a cheapskate. How old was your brother just now? If he is young, you can put down your mobile phone and play with him. That's good. If he is playing with a mobile phone, it is definitely not fun for him to play there alone. He must be playing with your mobile phone, too. If your brother is now very old and in his teens, but he is sensible, well, when he is studying, then you should educate him well and teach him to finish his homework before watching his mobile phone in his spare time. Children should not play with mobile phones for too long while studying.