Due to cirrhosis
,your father developed portal hypertension
So,fluid will be accumulating in the abdomen.
Even though,you remove it the fluid gets reaccumulated.It is natural for the disease.
It may become better with shunt operations.But,he has to be fit for that major surgery.
he should restrict salt,oily foods.
Green leafy vegetables to be taken.
Avoid red meat.He can take nuts.
Alchohol should be stopped completely.
Hope i answered your queries