What to do if my brother's pilfered my father's estate?

Question Details: My father passed away almost a month ago. There are 5 surviving children and no spouse. He has been estranged for his children for over 30 years now. My 2 brothers flew out to there and went through his house the day after he died; a neighbor let them in. They are not sharing any information of what they found with the rest of the siblings. But I have received a bill for 1/5th of the final cremation expenses. What should be happening right now? How do I find out if there was a will and what assets he may have had?

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