Hi Aniket,
I was traveling and was not able to reply earlier. The RBC indices suggest nothing as they are all normal, yet the electrophoresis suggests possible thal minor, but it is not conclusive. Electrophoresis of the parents may shed some light on this. Since iron deficiency can also cause small red blood cells, this may be the cause if his iron numbers have changed since he was on iron. His current iron numbers look good. If it is thal minor, it's not reason for much concern, as this is not a serious condition. It is possible that another hemoglobin variant is present, according to these results, so electrophoresis tests for the parents may be able to determine if there is another variant present.