I too will say the Mourner's Kaddish for you. I am not Catholic, nor is this prayer, however it's a beautiful prayer. I am, however, a Messianic believer. I'm especially fond of this prayer because it sounds amazing in Hebrew (well, technically, it's not Hebrew but Aramaic) when it's chanted and the meaning of the words are most comforting and profound.

Notice, that even though it's a prayer for time of mourning, there is absolutely no mention of dying, death, sadness or despair. Instead, it focuses on the greatness and glory of G-d. In our most difficult times, He is our rock and foundation, and in Him is where our comfort lies.

MOURNER'S KADDISH
An English Translation

Glorified and sanctified be God's great name throughout the world which He has created according to His will. May He establish His kingdom in your lifetime and during your days, and within the life of the entire House of Israel, speedily and soon; and say, Amen.

May His great name be blessed forever and to all eternity.

Blessed and praised, glorified and exalted, extolled and honored, adored and lauded be the name of the Holy One, blessed be He, beyond all the blessings and hymns, praises and consolations that are ever spoken in the world; and say, Amen.

May there be abundant peace from heaven, and life, for us
and for all Israel; and say, Amen.

He who creates peace in His celestial heights, may He create peace for us and for all Israel; and say, Amen.