South Africa Law
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You need to go to your nearest Magistrates Court and ask for the Clerk of the Childrens Court or the people that deal with Maintenance and Custody. They will then assist you with the process of applying for sole custody. They will provide you with the necessary forms and will also probably direct you to the Family Advocate.
You may also decide to make use of a private attorney.
The process basically is that you will serve an application on her for sole custody which she can defend if she wants to or not. The Application will go to the Family Advocate as well who will decide whether he/she will endorse the application or oppose it. This would be on behalf of the Children, not on behalf of the mother. Given that she has been staying with you mostly, makes it unlikely that the Family Advocate will oppose your suggestion.
The Court may refer you for mediation to come to some sort of guided agreement. If that does not happen, the court will hear the application and will then make a decision on whether you are to be awarded sole custody, or whether there is going to be shared custody.
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