Swollen feet and ankles (check if pitting) in a 94 year old man who has a history of stroke
and probably high blood pressure
(given the in take of lisinopril
10mg) is suggestive of a congestive heart failure
coupled with the presence of cough. You should take him to the ER now for immediate evaluation as his condition could get worst fast enough and get him quick to a more complicated situation.
Apparently he would require close medical attention. His kidneys will also need to be evaluated to see if there is no associated kidney failure.
Hope ths helps