Who is entitled to my father's estate?

Question Details: My father was a widower when he passed. His wife, my mother, is also deceased. They had 4 kids together. He also had multiple kids outside his marriage. Now since he's deceased, we've found out that he had no Will. I also have 6 brothers and 1 sister who are the outside kids. I was living with my father for some months before he passed. Now my other siblings, the outside kids, want part of my father's estate. I thought the estate automatically transferred to his spouse's kids? Are the outside kids entitled to some of his estate? Some of the kids we believe are not his but he volunteered and paid child support. On his deed he doesn't list anyone on it. Since I stayed with him can I get the house?

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