The issue in Spain IMO wouldn't be the kids or school (depending on the age of the kids - over 10 and you might encounter problems with the language) The big question is
WILL YOU BE LOOKING FOR WORK?
If so, think over 20% unemployment/ over 5 million unemployed etc etc.
Look at the stickies and do a search for work, unemployment, jobs, crisis etc and you'll see what I mean.
On the other hand I have no idea what the situation is like in Australia, but I seriously doubt it can be as bad as it is here in Spain