Hi.. currently my son is living in NZ and he is sponsering his fiancé to NZ form Malaysia.They planing to get marrige in December. But I can't attend to the wedding due to my illness and getting old can't travel long distance, in this case NZ embassy need an explanation letter from me state the reasons I can't attend to my son wedding. Just to support my future in law on her application. Please help my english is not that good and I don't know how to write it in formal language. Kindly asking for help, Thank you