As to the "stuff" this is a classic case of what I call the "pickup probate." Which means: the first one to the house with a pickup wins. Cruel, but true. Yes, you can sue your grandparents and uncles, but pursuing such a case won't be worth it. If your father died unmarried and you are his only child, then you are the heir. You refer to probate of a will, so the will controls and an executor should be named. I'm assuming the uncle is the executor and he is correct, the bills must be paid first. That includes using any vehicle. Vehicle title can not be lawfully transferred without probate. You need your own attorney.
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You can and should probably open a probate. By intestate succession laws, the children of the deceased parent receives the entire estate. The right to inheritance does not "climb" the family tree.
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I agree with my colleagues. There is also a chance that you will receive many of these items through probate, anyway. You can certainly show up in court and object to what took place. The judge may direct that the items be returned to the estate for your benefit. It would be better for you to be represented by a probate attorney.
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