Your timing might be good for hooking with someone going on the Pacific Puddle Jump. This is a very loosely organized group of boats (100 to 150 boats) who are heading towards French Polynesia from anywhere from California to Ecuador. Most boats stop in the Galapagos and then most go into FP through the Marquesas in the northeast corner. A much smaller group go a southern route to Easter Island and then enter FP in the southeast corner.
You can contact people who are doing this through a Yahoo groups group called Pacific Puddle Jumpers or through a sailing magazine called Latitude 38. There would be families doing it - we saw perhaps 3 or 4 this year when we did it. Only saw one group of young people, French, who had come down the east coast of South America and then gone to Antarctica - a very adventurous group.
We are going to be heading from Brisbane to the north and west but have not decided if we are going into SE Asia (if so it would be Indonesia, Malaysia, Singapore, Thailand) or towards South Africa in which case we will stay in the Southern Hemisphere. Also it is not a family or young people - I am old enough to be your grandfather.
In South Africa doing lots of boat stuff. Departure north from Cape Town around December 15th. Arrival in the Caribbean around the beginning of February, after 5300 miles or so.