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Thanks for your enquiry.
I am afraid to say that as there was no Will, the Rules of Intestacy are that all personal items/chattels of your father in law passed to his new wife.
These personal items therefore belong to his widow 100% and she is free to retain them/ do with them as she so wishes.
Likewise, upon her death, it depends on who she leaves her personal belongings to in her Will, or if she does not leave a Will, they will pass to her children.
Legally, there is nothing you can do to change the above scenario- it is not possible for any claim to be made against either your father in law's Estate or his wife's estate whenever anything happens to her. Your father in law should really have made a Will, leaving these items to your husband if he wanted to guarantee that your husband would receive them.
I am sorry this is not the answer you were looking for, but if I have assisted I would be grateful if you could leave positive feedback.