The one named executor. Otherwise, none of them have control and the court must appoint someone.
Yes. You should seek the advice of an attorney who specializes in probate to make certain the title to the property is transferred properly. In some jurisdictions a deed must be executed to transfer title to real property effectively.
A child.
Yes, a sibling can exclude other siblings as beneficiaries of their estate by specifying this in their will. However, laws regarding inheritance and family provisions may vary by jurisdiction and could impact the ability to completely exclude siblings from inheritance. It is advisable to seek legal advice when making such decisions.
You have to file in court for a guardianship or a conservatorship. You have to prove that they are mentally unfit to control their money.
Yes, it is absolutely invaluable if you own ANYTHING of value and wish to control its inheritance.
it is legal anywere.
Parent has more control then a sibling.
In most jurisdictions a legally adopted sibling is a legal heir. You would need to check the laws of your state. You can find state-by-state intestacy laws linked in the related question below.
That's the decision of the executor of the estate. If the other siblings want to keep the property, they would have to pay the other for their share.
That depends on the laws of the county in which you and or your sibling reside. In some countries there is an inheritance tax that may have to be paid.
There is no such thing as a minimum payment. There is no requirement that anything be left to a sibling.
No. A parent does not automatically become a child's legal representative in matters of inheritance. The court must appoint a legal guardian to control the minor child's inheritance in the best interest of the child. The parent may petition to be appointed but the court will make the decision after examining the child's situation.