This is song for Eucharist set to the tune GREENSLEEVES so everyone knows the tune already. The text is from the wonderful Delores Dufner.
If your voice cracks on “What Child is This” then you will have the same problem with this – maybe bring it down to Dm. At Small Church Music they split the difference and pitch it Ebm. Do go and check all the resources there for this tune including a BIAB file.
Dufner’s text is at OCP in their preview and they will happily sell you the sheet music to a public domain tune.