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When your father died without a will, were there any assets in his name alone?
So are you saying the only things that were left that were not at least partly owned by the stepmother were some of his personal effects?
What type of belongings are you asking about exactly?
So unfortunately you don't have a legal right to those belongings because your stepmother would own them once he died.
So you cannot compel your step-sister do give you these articles even if she does have them.
But you may be able to scare her into doing so by having a lawyer send her a letter threatening a lawsuit. While you cannot sue her successfully to avoid a lawsuit she may give you what she has.