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Your husband's third cousin is just considered your third cousin through marriage.
Your grandmother's third cousin is your third cousin, twice removed.
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.
Third cousin.
Yes. If your husband's cousin is his first cousin, the cousin's daughters and your children are second cousins to each other. If your husband's cousin is his second cousin, the children are third cousins to each other.
Yes, you are related to every pereson who is your cousin, because "cousin" means that you have a common ancestor.
Your dad's second cousin's son is your third cousin.
Your son and your third cousin are third cousins, once removed, to each other. Your son and your third cousin's son are fourth cousins to each other.
Your grandfather's first cousin's niece could be:your motheryour second cousinsomeone you are not related to (for a niece through marriage to spouse)
If your grandmother's sister was a cousin (presumably first cousin) to your husband's grandfather, then your grandmother was also first cousin to your husband's grandfather. You and your husband have a great great grandparent in common and are third cousins to each other.
Your first cousin's child is your first cousin's, once removed. Your second cousin's child is your second cousin, once removed. Your third cousin's child is your third cousin, once removed.
== NO she is not related to you. == No, she is not your cousin at all even though she's your husband's cousin. You are not blood relatives. If you like her you could put her down for a personal reference for a job, but other than that you don't have to mention her at all for a job.