Hi Becci
I can see that this is difficult for you when you are not in charge of your parents' application and your parents probably aren't that concerned about whether or not your boyfriend can go with you. (Plus his own parents might well hope that he can't!)
I reall think that your parents need to speak with a Registered Migration Agent because although it may be very straightfoward for your parents, and for any children younger than you, I think there could well be quibbles about whether or not you can be included in the family's visa-application as a dependent child still.
If you cannot be, then I suspect it is going to alter the whole picture and it might be that your step-father would not take the job. So I think you really need to find out more about your own status before we start trying to work out a route for your boyfriend as well.
Please see here:
http://www.immi.gov.au/immigration.htm
There are about a dozen different skilled visas, some of them temporary, others immediately-permanent. Try to find out whether your mother can tell you which subclass of visa is being discussed. (How old is your stepfather, by the way, because that might narrow it down?)
Look where it says applications and forms. There are application forms,
information forms about every visa, and information Booklets about the different main visas. Th information forms and Booklets are particularly useful.
For a list of Registered Migration Agents, please see here:
http://www.themara.com.au/Online/Default.asp?DeptID=117
There appear to be none in France. No worries. There are several in the UK and in Australia. If you go to the Register of Agents, where it says "Find an agent near you," use the Down arrow to select Country and then type in the country name.
If you do a search on here headed "migration agents", you will get loads of names.
Shout if you want more help at this stage, but I would say let us focus on you first. Once we know whether or not you would be able to move to Oz on your parents' visa, then we can start thinking about how to get your boyfriend there too.
Cheers
Gill