HOw to reserved deaceased members names
I am just another 'lowly' User/Patron ...
[ And, I happen to be a Member of the Church ... ]
Just in passing ...
Provided, that you are, a Member of the church; and, referencing "Temple' Work ...
Just for starters
Here is a "Knowledge Articles", in 'FamilySearch':
How do I request or reserve temple ordinances in Family Tree?
There are ALSO, Other "Related", articles included, with that particular article.
I would humbly suggest, that you directly contact; and, consult with, the "Temple and Family History, Consultants", in your (Local) Ward/Branch.
I hope, that this may help/assist, somewhat.
@Brett . 's answer appears to cover your question so I am unclear why it has been rejected. Could you clarify please?