I respectfully disagree. First of all, if your goal is Manhattan, there’s no reason to specifically choose Newark over JFK or LaGuardia. The train from Newark to Manhattan is definitely more expensive that the subway from JFK, and a taxi would be significantly more expensive. Second, driving into Manhattan, leaving the car in a lot for a couple days, and taking public transportation around the city will probably still be cheaper than flying, at the prices the OP originally mentioned. However, I’m not entirely sure if the numbers quoted in post #36 include money lost by taking time off work, which is certainly something to take into account. If not, I’d be very curious to know where the $3,000 figure came from.
There are inexpensive options for getting into Manhattan from Brooklyn, Queens, and New Jersey: subways, MTA buses, NJ Transit buses, jitney buses, or Path trains. NJ Transit trains would be the most expensive option, and that would probably still cost less than parking in Manhattan. I live and work in Manhattan, and I’ve had coworkers from New Jersey, Queens, and Brooklyn with commutes shorter than mine. I do see how it can sound very confusing when you’re not from the area, though.
justanothermike, if you do decide to drive, I think it would be helpful to know roughly where in Manhattan your family lives. If they live in lower Manhattan, I’d probably recommend staying in Brooklyn. If they live on the East Side, I’d suggest Queens. If they live on the Upper West Side, I’d suggest Newark or Hoboken, but if they live farther uptown I would look for a place in NJ that would allow easier access to the buses that go over the George Washington Bridge.
The benefit of having access to your car while you’re in the area is that you could easily take a day trip somewhere outside the city, if you like. You can also pack as much as you want, and come and whenever is most convenient for you. The benefits to flying are that it will save you time, and you can stay wherever you like without having to consider parking. You will also perhaps get a slightly more authentic experience, because most Manites (at least among the ones I know) don’t actually own cars.
In conclusion, there are pros and cons either way. If you choose to drive, I’d be happy to help you figure out the best area to stay in, and how to get from there to where you want to be. If you choose to fly, enjoy your flight and remember to put your tray table up. Keep us posted!