Thanks to every one for the comments
What i meant by job security was being replaced by a local just because you are foreigner.i understand there is no job security in developed world
I am not worried about the cultural difference. We moved from France to the uk and we are currently living in Hong Kong so nothing could be shocking for us. but all these years my husband stayed with his company (a french bank)but now he has an offer from a Q-company
i am not worried about the school either since my kids and myself are moving to Qatar in a year not immediately.