There are some great searchable sights with Friesland information. The 1811 list of family names is filled with KOOISTRA, I stopped counting at 70. I didn't find the surname Boilens. Go to:
http://www.asksam-nl.com/zoekfam.htmI wasn't able to get through to GenLias tonight, but chances are you will find marriage, birth and death records you need:
http://www-lias.rad.archief.nl/If you can't get through, keep trying. They are downloading some new information.
Good Luck!
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