Do you really want a beer that strong at a wedding? I've got a 4.5% alt and a 8.5% strong golden w/ raspberries on deck for mine in 6 weeks, and I think even the 8.5 is way too strong. You don't really want people getting drunk at a wedding... I've seen it plenty of times while working a photobooth at weddings, and it's just not pretty. Plus it's in July... nobody is going to want heavy beers.
Now what would be awesome, is to have your sister and her husband over and you all brew the beer together, and they can crack some open each year around their anniversary. A beer that strong would age for a long time. I think we're planning on doing something like that after we get back from the honeymoon.