"In the name of the father son and holy spirit"
Translation:Kwa jina la baba mwana na roho mtakatifu
In a normal way of speaking, both sentences don't sound natural at all:
In the name of the Father, and of the Son and of the Holy Spirit (Ghost) : Kwa jina la Baba, na la Mwana, na la Roho Mtakatifu
That's what you'll hear from most of the priests. So, by considering that it's just for learning purposes, you have to answer as how Duo asks.