My father has low hemoglobin he has had 5 bags of blood and 1 bag of iron in the last three weeks after all this his level is now at 119 and falling?

Anemia. It sounds as if your father is either not making enough red blood cells or they are being destroyed or lost. A complete workout should be done to determine if this is an error and blood cell production or if he is losing blood cells.
Anemia. It sounds like there needs to be additional workup to determine the reason for your father's anemia. Iron deficiency anemia is usually due to blood loss rather than a lack of iron intake. Tests such as a colonoscopy are often done to look for gastrointestinal blood loss.