A few points of speed reading though would make sense to investigate housing benefit as every penny is going to count. The british citzen is allowed to claim but the wife is not. Like with child benefit I understand the British Partner can claim but the non Brit can't..
Also although its best the Brits bank balance especially if not working looks healthy if the applicant can bring savings to show for the first six months of life that they can survive will also count in any application..
Also yes i understand there are visa for keeping a family together one of the Wifes friends from her hometown was in a sticky situation and applied for one to stay with her british born baby son in the Uk. But she was still here and a slightly different situation..
If they were living in Phills for more than fours years together im pretty sure you could apply for a spouse visapretty easy Gotta dash off in a moment but will try and have a think about it as I cover a bablikayan box in sticky tape!!!