Thanks for your query.Based on the facts that you have posted it appears that your father who has recently an attack of paralysis
and is unable to pass urine.
Looking at his age he may have associated Benign Enlargement of Prostate or may be due stroke that he has.
Please consult qualified urologist
for clinical and digital rectal examination
and get his Ultrasound
scanning of the abdomen done to confirm the diagnosis.
You can catheterise him for couple of days and put him on broad spectrum antibiotics to prevent getting UTI.