Icarusnc,
First off you are mad to think about Angola as a place to take your family for a holiday! Luanda is the one of a few places in the world that's classified as a **** hole! and we're not joking.
It's also not a place to get work and then bring your family to. Most expat workers are there fly in/out contracts. Oil contracts are generally 5 weeks on 5 off. Others are more around 2 to 3 months on 1 month off, some single guys stay longer for the extra cash.
I'd highly recommend contacting operators in Africa before heading over or it could be a huge waste of time if you don't know what your doing?
There is not many contracts in Africa where you could bring your family and work. But there is plenty of contracts if you don't mind flexibility and hard work.
BB