seniorjudge said:
No; every party on the deed must agree to the change.
**A: not true. A conveyance of interest by one joint tenant (approved or not approved by the other joint tenant(s) automatically creates a tenancy in common tenancy. For clarification; the title and titleholders remain the same and the tenancy changes.
You are correct. I should've made it clear that I was assuming that OP wanted both names as they are now on the deed and to change the JTWROS to tenancy in common.
I suppose he could do that if he would convey his interest to a straw man (thus destroying the joint tenancy) having the straw man deeding it back to him, but that seems awfully risky.