Haemoglobin 5 indicate that your father have severe anaemia
And occult blood present in stool indicate that internal bleeding present in gastrointestinal tract.
Treatment- option is to increase to Haemoglobin level and also to find out what is the reason behind the bleeding.
For correct diagnosis and treatment you should take Consultation from a good doctor.
Next Steps
Take consultation and do test which doctor will told.
Health Tips
Your shuld also change your life style like take sufficient amount of water and taken l spicy and fastidious