Dolores said:If the mother is legally divorced from the father and has guardianship she probably can leave the country with them without the permission of the father. You need to double check on this with Migration to not be surprised at the airport. Otherwise, she will need the authorization of the father, and to go through the many steps for one of the parents to take a child out of the country without the other.
As said above, probably the easiest way to go about this would be by marrying your girlfriend.
Hillbilly said:That is a big step up....but you'll have to do a lot of following up...
Just a note based on over 40 years experience in Dominican education.
They can get 90s all the way through school and still not be able to read a newspaper. That's a fact. How good they turn out will depend a lot on you and your demands. This is especially true the further away you are from a major population center. (Yes, there might be exceptions, but not many.)