Both sons are below 12 years of age. No detailed study can be made except for a study of Balarishta.
Elder son’s moon is in the 6th house of Roga but is unaspected by any benefic or malefic planet. Lagna is occupied by the 3rd and 6th lord Jupiter. No planets aspect Lagna. Lagna lord is in its debilitation and aspected by Saturn, moon and Ketu.
For the younger son, Moon is in the 3rd house aspected by Saturn and Ketu. Its dispositor Jupiter is placed in Lagna in its debilitation house. Saturn, the lagna lord is also in lagna. Lagna is aspected by Mars and Rahu. Mercury (who is the rogakaraka) and Sun who sit with Mars are also in the nakshatra of Jupiter.
In both cases, Balarishta is present to a small extent.
You have mentioned that you are unable to do any remedy. But a remedy for pitru dosha is needed for the elder son. May be done at Gokarna, Triambakeshwar or Rameshwaram when you come to India.