Handbook 1/2: 0.3:
Leaders who have questions about information in the handbooks or about issues that are not addressed should direct the questions to their immediate presiding authority.
If the stake president has questions, he can refer to the area authority or whoever the next step up is.
Personally, I'd say "no". I notice the phrase is "married", not "sealed". I don't know of any verbiage in the church that considers a widower who is sealed as "married". He would be considered a Single Adult. (See the first sentence in Handbook 2: 16).
However, I'm not seeing anything that suggests that once called that his status would change when/if his wife dies.
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