Just to confirm, home schooling is NOT allowed here in Dubai. As for bringing your wife and five kids over, the you should know that EK only support up to three kids. Therefore travel and schooling for two of the kids is at your own expense. I am not sure about medical cover, but very few pilots have more than three children. Also there are very few villas that would be suitable for a family of seven. But I am of course assuming that you are not financially independant, however you cannot afford to bring your wife to Dubai...
With regards to the interview, just be honest, fly the sim like any other plane, react positively with everyone that you come into conatct with and convince them that you are a great guy and will easily fit in. It really is that easy now.