I think that getting this boat running again would be a great project for you because it is part of your family heritage....more than just some fiberglass...wood...cast iron and aluminum...
Anyway...you have some real work here...one is that the engine may be locked up from rust....I hope it was well fogged when put away...the other is the fuel tank will have to be cleaned out...carb cleaned and rebuilt...fuel lines replaced...those are the basics....if the engine is locked up there are ways of freeing it up. What I would suggest is go over to
http://www.iboats.com and joint the I/O forum...of the boating forums I visit...this one has the most knowledgable mechanics....ask your questions there...
and good luck with it....don't be discouraged if it takes a while and a fair amount of money to get this going again....in the end it's part of your family heritage worth preserving....
I spend 2006 and part of 2007 resurrecting my '88 Horizon that had a rotted deck and stringers...I did some of it myself but hired out the worst of it to the 'glass shop...and in the end it came out great...cost some money...but I ran the boat second half of 2007...all of 2008 and now again in 2009...21 years old and still going....
BTW I am a Jeep nut too...still driving my old 98 ZJ (Grand Cherokee) I test drove a 2007 Grand Limited with the 5.7 today...this one is a rocket ship...it takes off like a '69 Charger and drives great...may wind up buying this one if the price is right and it checks out...