Yes. This is legal and socially acceptable.
Yes, Albert Einstein's second wife, Elsa Lowenthal, was his first cousin on his mother's side. Lowenthal also happened to be his second cousin on his father's side
No. The children of your second cousin are your second cousins once removed. The children of your second cousin and yourchildren are third cousins to each other (removed is the generations moving on only one side).
Assuming that the man and the aunt are not blood relatives, I do not see why not.
That will depend on the laws in your state or country. It is allowed in many places and illegal in others.
Your third cousin may be related to your fourth cousin, but may not be. It depends on how they are related to you. Your third cousin is descended from one of your great great grandparents. Your fourth cousin is descended from one of your great great great grandparents. If the particular great great great grandparent who connects you and your fourth cousin was a parent or uncle/aunt of the great great grandparent who connects you and your third cousin, then the two cousins are related to each other. If not, the two cousins are probably not related to each other.
Yes, you could ate your fourth cousin and in some cases people can marry a fourth cousin as they are far removed enough genetically to have children. However, it is the family that may have a problem with fourth cousins dating.
Yes you can marry her. She has no blood relation to you. She is just the niece of your brother's wife from her side. It is no different than if two cousins married two women who were sisters.
Your cousin's cousin is no relation to you.
Not your cousin but married to your cousin. Or can mean Cousin on other side of family.
Your first cousin's grandchild is your first cousin, twice removed. Your second cousin's grandchild is your second cousins, twice removed. Your third cousin's grandchild is your third cousin, twice removed.
She would be your second cousin.Your father's first cousin is your first cousin, once removed.The daughter of your father's first cousin is your second cousin.The daughter of your father's first cousin is your father'sfirst cousin once removed and your second cousin. Second cousins are people who have a common great grandparent. First cousins are people who have a common grandparent. Cousin relationships between people of different generations are determined with reference to the cousin who is closest to the common ancestor, and by the number of generations between the two cousins.
Your father's cousin's cousin could be:your fatheranother of your father's cousinsa cousin of your father's cousin who is on the opposite side of the cousin's family to your father