Hi Dear thanks for your question.
Your father 61 year old Diabetic is having Cholilithesis that is gall bladder stone
and fatty liver
.Relax there is nothing serious,both condition are treat able.For mild fatty liver changes,he has to do nothing except to decrease his fat intake and go for exercise
.For Cholithesis consult some surgeon and get his gallbladder
removed,he will be symptoms free.
Hope i answered your question.