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Well first of all if there is a serious fall you should have it looked at by a doctor.  There might be a fracture or a torn ligament.  You professional advice.

If the diet is poor healing will be slow.  Try to consume bone soup, gelatin, sulfur bearing foods like eggs.  Make sure your brother is eating lots of protein.  The best source is whey protein or hemp protein or egg protein.  Also you must use healthy oils in the diet like like cod liver oil, flax seed oil, coconut oil and nuts in general.  Eat cartilidge from bones like chicken bone cartilidge.  All of these can be very helpful with the healing process.

Lastly, stay away from high calorie foods because they cause cellular stress.