Unless there is another issue, such as a Court order requiring the children to stay with their father or finding the mother unfit , there seems to be no reason why the parents could not simply agree that from now on the children will live with their mother. If the parents are say, divorced and the children live with the father pursuant to a court order, it might just be a matter of going back to the court and asking for that to be changed, assuming both aprents agree.
Only an attorney licensed to practice in the Bahamas would be able to represent your husband in that jurisdiction. I would suggest 1) you contact the Bahams Bar Association for a referral and/or 2) If you have an attorney in your home state with whom you deal regularly, ask him/her for a referral. Even if he doesn't know anyone, he is better situated to make inquiries for you.