Two parents, two boys 14 and 17
Watersports more than fishing.  Cannot say for sure what sports, plan to have kids in on the call as well for their input.  I imagine tubing, skiing, maybe wake-boarding.  Fishing would be casual stuff.
Depth of water at end of dock, measured last weekend is 5.0 feet.  And at about 10 feet in from end of dock water depth was 3.5 feet deep.  We are told lake level does not vary greatly throughout he year, maybe 1 foot and I presume right now we are closer to lower water level time of year than highest levels.  I did not think to measure dock, but the previous owners could park a pontoon boat along side it with 3 - 5 feet to spare form shoreline (estimate).  Main dock therefore must be at least 20 feet long, plus a 3 - 4 ramp section to shoreline.  I may have some photos at home I can send later.  No boat house, but there is a 2-car garage, depth of the garage from front to back is 23 feet +/-.