Your father seems to be suffering from BPH as on USG his Prostate sIze is larger than normal, bladder wall is thickened and Post void urine is high.
You can start Tab Rapilif 8 mg once a day at night and Tab Mirago 25 mg once a day at night
Next Steps
Get a Urine Culture, Uroflowmetry, Serum PSA. Consult a Urologist for physical examination of Prostate.
Health Tips
Dont drink too much water in the evening.