The stuff is actually gold and silver coins worth a considerable sum. They have always been kept in their safe, as DH and I were in rented a while with nowhere to keep them. And then there are the savings books for accounts FIL opened in DCs' names, but refuses to let us have the books for.
Narcissistic arsehole FIL summoned DH to come and pick the coins up, saying he no longer wanted to be burdened by them. When DH arrived, FIL decided he wasn't going to let DH have them and took the opportunity to scream and shout at him instead. (We are in the process of going no-contact.) He laughed at the suggestion DH take the savings books. He said if he was going to save money for the children, it was going to be completely on his terms and had nothing to do with us.
When DH felt that FIL was going to get violent, he left, empty-handed. And very shaken.
How do we get the coins and the savings books? We can prove we are the legal owners of the coins, and as the accounts are in the children's names we are the legal owners of the books, too. But if he won't let us have them back, what can we do?
Many thanks.