Mydad,
According to the
Iron Disorders Institute:
After as few as 10 blood transfusions the signs and symptoms of iron overload can be seen in some people. It is important to be aware of this and discuss with your doctor a plan to lower excessive levels of iron as part of your therapy to achieve iron balance and adequate levels of red blood cells.
Some patients don't need treatment for iron overload for years, but others do much sooner. Excess iron is like poison in the body, a threat to organs, so you can't ignore the issue for any patient receiving regular blood transfusions. Your dad should have his iron levels monitored so it will be clear if and when treatment for iron overload becomes necessary.