Is the pain too much during morning and gets better as the day progresses? Your father may take few pain medications and fomentation ,if pain does not gets better you may consult a Physiotherapist  for the same .. Ultrasonic therapy along with stretching and strengthening exercises are found to be very effective in such type of cases .

Hi , So this looks like Plantar fascitis along with Heel spur. Ask him to get his Uric Acid checked . Take plain Analgesics for a few days . Alternate Hot/Cold foemntation. Soft sole shoes , Silicon heel cups in shoes . Calf stretching exercises before getting up from bed.