Avoid very spicy food, very oily food and all that. Tell him to completely quit smoking and alcohol, as they will do more damage than anything else. Nad aslo ask him to dring lot of fluids.

Pancreas is one of the primary gland for digesting vital nutrients such as Fats, Protein and Carbohydrate. It is also responsible for the glucose metabolism and the home for the production of Insulin and Glucagon. There may be various cause to the pancreatitis such as Calcium diposition, Stones, Alcohol intakes, Genetics etc. But the facts you mentioned here seems that the cause due to your brother's pancreatitis is intake of alcohol. The best I could suggest to you that -
1. Avoid alcoholic drinks
2. Avoid Rich foods
3. Give more preferences to Carbohydrates first, then Proteins and the Fats the least.
4. Take advice from a reputed Gasteroenterologist.
5. Have more fruits and green vegetables.

** NOTE: Try to have simpler Proteins and Fats (avoid if possible) and complex carbohydrates