My father has Parkinson's and mild dementia. He has pneumonia and I can hear the mucus rattling in his lungs. He is on antibiotics and prednisone. The doctor saw him yesterday and his lungs sounded pretty clear, but today the rattling is back. The doctor told us the best thing to do was to get him to cough, but he is weak and can't cough when we encourage him to. Sometimes he does cough on his own. He has some issues swallowing so we thicken his liquids, but he is still eating well. He has no heart issues. Any suggestions for us, please?