Where are they at the moment?
How long has your sister in law been married to her new husband?
You will have to contact a Belguim attorney for advice on their immigration system, this is a UK law forum and there are no such attornies on this site.
The eligibility crtieria for a spouses visa is as follows (suggested supporting documents in brackets):-
You will need to apply for settlement (ie. spouses visa) by using form VAF4 Settlement, available for download from UKBA's website. It would be best for either a solicitor in the UK to prepare it in consultation with both you and your wife before submitting it.
He will also have to pass and english language test showing he has a basic command of spoken and listening English. He can find out approved test providers in his area by contacting the UK embassy nearest to him.
Because of the lack of time between the death and the marriage the UKBA may have douibts as to the genuineness of the marriage so the primary focus of the supporting documents (eg. statements and documentary evidence (correspondence etc)) should be to substantiate the fact that this is not a sham marriage.
It would cost around £800-1000+vat for a solicitor to prepare it on his behalf, or around £300+vat for them to check it. They can prepare it before you leave so that once you are married he can submit it straight away.
You can find Uk immigration solicitors through the following Law Society Website search engine:-
The UKBA aims to reach a decision on all applications within 6-8 weeks of submission.
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