Praise be to Allah.
We thank you very much for expressing these kind feelings. The fact that you have not stood in the way of your daughter and her husband in their following of Islam is indicative of your fair mindedness and respect for the beliefs of others. At the same time, we cannot hide our wish that you could join us and your daughter and her husband in following this religion, the great religion of Islam. We know that the matter may appear difficult, especially for a man who represents and studies another religion, but who knows, maybe this study will be followed by a proper study of Islam which will lead to a new conviction. We wish you well always, and pray that Allaah will guide us all to the path of truth and guidance. Thank you once again.