Hello. Your wife s father needs urgent medical attention and hospitalisation. His symptoms of vomiting greenish liquid are suggestive of bilious vomiting and the fact that he is peeing less and sometimes with streaks of blood are suggestive that slowly the kidney function has been decreasing. He needs urgent medical attention and investigations like - a complete blood count to rule out any precipitating infection, liver function tests which may show obstructive jaundice, kidney functions tests, etc. He also needs and ultrasound of the abdomen to visualise the biliary tree, liver and other intrabdominal organs. Treatment will then be according to the cause - but initially it will mostly include stabilising his general condition and correcting any electrolyte abnormalities by intravenous fluids, intravenous potassium, etc. He may need to be kept nil orally for sometime till he is able to tolerate food by mouth. Hope this helps. Regards, Dr Geeta