Answer:
They want to teach him because they want him to make his own living by a source...
Explanation:
It is possible that the parents are old and aren't in a condition to support their child. It is also possible that they both have Diabetes Mellitus already that's why their child also has and they couldn't keep up with him. They wanted their child to have proper medication throughout his lifetime so that he can continue his study and make a living by his own means.
