Your question is about that your uncle who lives in your locality make chapatti in the hotel due to which his hands get burns and what possible solution we can give so that his hands will not get burns.
You can ask your uncle that he should ask his boss to give him some equipment like Tongs (chimta) and spatula. So that his hands will not get in direct touch with hot chapattis. In this way, he can avoid burns.
You can ask him to put some ointments like water gel, Burnol etc. which is easily available in the market and he can also apply other home remedies such as aloe-Vera or toothpaste on the burned area and he should use a toothpaste in paste form, not in gel form.