✔ 最佳答案
It depends on the matter in question and your standing in the case. If you are not a member of the person in question's family, you should have the lawyer representing the side in question present it and/or call you as a witness as appropriate.
In general, an unsolicited letter will be given very little weight if at all, because the judge is bound to rule based only on materials presented during the hearing. To be sure your information gets heard you are much better going through a lawyer.