I agree; this is your son's wedding. You should be there enjoying the show and not running around trying to capture it all!
I don't know anything about the Fuji camera or its lenses and what equivalence they have with regards to the DSLR, but, the 50mm would be the ideal portrait (head/shoulder) lens which is equivalent to the 85mm on a full frame. The 200mm is too long.
Unless you have access to multiple DSLRs that can take some primes and a zoom (I usually run with a 5D with the 85mm, 5D Mark II with the 24-105mm and the 5D Mark III with the 70-200mm) I'd be reaching for a 24-105mm, at the very least.
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