Family disputes raise the wall of misconception and mistrust, sometimes, they expand too much which result in open enmity too. I think in this situation the third person like you should stay away from their bilateral disputes. It makes a bad name for the third person from either side. Because if you have some soft corner for one person another person will have ill feelings for you as well.
However, if we are really sincere and worried about any mistrust between two neighbours we can come forward to have patch-up between them to eliminate prevalent mistrust between them which in my views is a great service of humanity.
As parents, they can decide about their children's future. Leaving her without any education is not correct and they should see that she will attend tuition regularly and study well.
Knowledge is power.
This can be settled amicably with your intervention since you are familiar with the family developments and you will have to apply your institution how best the animosity between the two brothers could be resolved so as to end the present impasse. With your efforts, the career of the child could be saved.