This was a TV series with Frazer Hines and Melvyn Hayes in it.
It was based in occupied Poland and a family had found themselves separated from their parents and they began to re-discover of each other.
'Jan' was an orphan scavenger who had visited her old wrecked house and found a letter-opener - the 'silver sword' of the title - which he produced when the family coincidentally met him.
it was a drama, with the odd nazi here and thee but had a happy ending.
Do You Remember The Silver Sword?
Do You Remember The Silver Sword?