I have gone through the same situation. What you need is a letter from the UK government certifying that you are the legal guardian. I was asked for copy of marriage license, bank statements for the last six months, documents stating that my wife was the legal guardian. Ironically the Qatari officials only wanted to deal with me on this matter and not my wife. Have your husband make it a point to his employer that he will not allow your family to be split up.