Again, Indigo has made excellent points and I don't have very much to add
But as a very simple example - if the mother of your child is indifferent to the fact that your child is gifted, I would say the first thing I would recommend is to provide a safe place for that child to be gifted. Provide stimulation in their areas of interest, as well as patience. Try to do this in a way that does not create create conflict with the child's mother if possible.
The first thing I would do is learn as much as you can about giftedness and your child's giftedness. Since you are here, I think you are already started on that road.
