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How should I word this letter?

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My godfather and his wife have just recently moved from India to Ireland. When they got to Ireland my godfather left his wife and moved in with his parents. Now his wife is not an Irish citzen but she wants to stay in Ireland. So me and my parents said that we would write letters of support for her. As I am her partners goddaughter i think it would help, and she agrees. But I don't know how to write this letter so that it could stand in a Court of Law. Can anyone help?