were does this leave his kids ? from first marriage ?
What age are the children? Are they grown up? Do they expect anything? If they are young, was he paying maintenance and did he put a life policy in place to cover this eventuality?
If they are grown, then unless they feel hard done by and unless there is a reasonably large estate, its hard to know what they could be entitled to.
They could contact a solicitor and ask the solicitor to advise, to write to widow and ask the question. They could place a Caveat on the Estate - in the Probate Office - which would prevent any Grant being extracted without the knowledge of the person lodging the Caveat.
mf