jetblue

I have a reservation on a JetBlue flight this coming Monday and have already purchased an extra-space seat. I just checked online and there's someone else now sitting in my row, but there are several extra-space seats in rows with no other passengers. I'd like to change my seat to one of those...

Couple of traveling questions! We are planning to visit Disney the first week of December. Traveling from BOS. Is this a good time to go? :) JetBlue: front of the plane or back of the plane? Is the extra space worth the money? We will be with a 3 and 4 year old. First time!