Hi,
Welcome to HCM,
Your father is having Liver Cirrhosis due to this he is having ascitis in this disease accumulation of fluid in peritoneal cavity,just reducing fluid in abdomen may not be enough,if it is causing discomfort paracentesis may be done which is removal of fluid by needle aspiration.
Please consult Gastroenterologist and there are many medicines which can be given.you need to check his serum protein level and if it is low blood or salt free Albumin may be useful.
If this disease is due to Alcohol please make sure he is not taking alcohol.
If he is compensated and takes care he should continue to do well,see no one can predict the eventuality.
Please take care.
Good Luck.

Hello,
Ascites is a major complication of cirrhosis.
The development of ascites is an important landmark in the natural history of cirrhosis as it is associated with a 50% mortality over two years,and signifies the need to consider liver transplantation as a therapeutic option.

Firstline treatment of ascites should be spironolactone alone, increasing from 100 mg/day to a dose of 400 mg/day.
If this fails to resolve ascites, frusemide should be added in a dose of up to 160 mg/day, but this should be done with careful biochemical and clinical monitoring.

Patients with large or refractory ascites are usually initially managed by repeated large volume paracentesis. 

You must consult a gastroenterologist surgeon and explore the possibility of liver transplant,which is the most ideal treatment,if it is possible in your father.
Thanks