Question:
Answer:
From a Catholic point of view, there would be no objection to you praying Kaddish for a deceased relative. Kaddish, as I am sure you know, is the Jewish mourner’s prayer. It is a prayer of praise to God; as such, it is not contrary to Catholic theology.
However, Kaddish is prayed as part of a minyan, a group of ten Jewish adults, and there may be an issue for Jews that you should keep in mind. Many Jews do not consider Jewish converts to Christianity to be Jews, and that will matter when a minyan is being assembled.
If you are not needed to complete a minyan, then you need not say anything about your status as a convert. But if you are being counted toward the required number of ten, then it would be a courtesy to let the leader know that you should not be counted for this purpose.