i think the only way your children being British citizens would help your wife, would be that it shows your relationship with your wife is genuine, especially as you've been married so long..
you needs a job which you have, some savings (£2,000+ , save it, use your credit card or borrow money from family/friends)
also you need a place for your wife to live without it being overcrowded, any chance you could live with your parents ? ..
sorry to hear about your children being ill![]()