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An ex-wife, unless specifically named in a will created after the divorce, is not entitled to anything.
If the property is owned by a valid trust it is not part of the decedent's estate. The purpose of the trust was to protect and preserve the property for the children. The second wife has no rights in the property.
Your brother's wife is not an heir to your sister's property unless she is named in a will. Your brother might be such an heir if there is no will or if a will does not explicitly exclude him. If your brother dies after your sister died, then his estate would be an heir to her property and his widow, as heir to part of his estate, might receive an interest in your sister's property. Consult an Attorney who specializes in wills and estates. The laws of each state can be different enough that the real answer could be different depending on which state your sister was a resident of when she died.
The wife has full rights. She is the natural heir for all of the property, so can certainly contest the distribution if she does not agree with it.
if they have children over the age of 18 they have to sign off on everything they own cars ,houses boats etc if the children are under the age of 18 the wife is the sole heir
No. Generally, heirs-at-law must be related by blood or by legal adoption. Your father's second wife is not related to his children by his first wife. If the children were legally adopted by the second wife then the answer is maybe, depending on the laws of intestacy and whether she had a will leaving her property to someone else. You can check the laws of intestacy for your state at the related question link below.
Oregon is not a community property state. The husband is not an heir of his wife's father. The husband has no rights in or to to the real estate.
It should be current wife first, then their children. First wife next, followed by their children. "His first wife, (name); their children, (names in birth order)...."
His second wife was Anne Boleyn, she was executed on false charges because she didn't provide him with the one thing he wanted from her....a legitimate male heir to the throne.
He had 7 children with his first wife and 8 children with his second wife so in all he had 15 children.
Assuming no Will, if community property, then all goes to wife. If separate property, then divided between wife & kids.
Julius adopted Octavius when he was four since he and his wife had no children together and he needed an heir.