Madam i need to know about your father's condition in detail.
Only this much history won't help.
There are many reasons for increased frequency of urination for eg urinary tract infection.... Overactive bladed muscles.....weak bladder or pelvic floor muscles....
diabetes....BPH ( prostate gland enlargement) etc.
So we need to rule out things to come to the best possible diagnosis.
Does he feels thirsty all the time??????
Next Steps
consult for better understanding and treatment.
Health Tips
Avoide drinking fluids before going to bed
Limiting the amount of alcohol and caffeine
check his RBS if you have glucometer at home.