Don't know whats happened to the rest the read more isn't working.

Stephchildren, If memory serves they will want the Birth Certificate which should prove they are your (the Sponsors) children. So could cause you a problem.

We were advised to change the monthers surname on the birth certificate of our 4 yr old after we got maried to avoid complications here.

I have a feeling you will have to adopt.

If your company has a good PRO then get them to ask him, and do what he advises, he is the one that has to push all the paperwork through the Government for you. Don't take my advise or anyone elses if it seems like there may be a "Way round it", there probably isn't