Just check the medications you uncle is taking. Sometimes medicines like 'duphalac' or 'lactihep' are prescribed for patients having liver cirrhosis
. They can cause loose stools and need to be stopped. You can ask your uncle to take probiotics and a newer drug Rifixamin which can help with the diarrhea
. You can discuss these with your treating physician and they can prescribe you the same.
Hope this helps
Dr. Om lakhani