In a lot of countries around the world is it legal to marry your first cousin. Checking with the local licensing office is the best way to find out if you will be violating any laws. Children born of cousins do have a slightly higher risk for genetic disorders.
The nephews of your first cousin once removed, like the children of your first cousin once removed, are your first cousins twice removed.
Your mother's first cousin is always your first cousin, once removed. That is at the core of what first cousins and removed cousins are. That relationship will never change; your mother's first cousin will always be your first cousin, once removed. The term "cousin by marriage" is relatively new and undefined, and for many it really does not mean anything. Some people use the term to refer to someone who has married a cousin. In that sense, if someone marries your "first cousin once removed," that person would be your "first cousin once removed by marriage." It is completely incorrect to claim that someone who marries your first cousin is your "first cousin once removed" simply because of that marriage.
Your first cousin and your children are first cousin, once removed. Your second cousin and your children are second cousins, once removed. Your third cousins and your children are third cousins, once removed. And so forth.
Your grandmother's first cousin is your first cousin, twice removed. The children of her first cousin are your first cousins, once removed.
Your first cousin's children are your first cousins, once removed. They are your children's second cousins. Your second cousin's children are your second cousins, once removed. They are your children's third cousins. And so forth.
Your first cousin's daughter is your first cousin, once removed, and her children are your first cousins, twice removed.
Your daughter is first cousin once removed to your cousin. Your daughter is second cousin to your cousin's children. Your cousin's children are first cousins once removed to you
Your parent's first cousin's children are your second cousins. Your children and your second cousin's children are third cousins. Your children and your second cousin - or likewise you and the children of your second cousin - are second cousins, once removed. You and your parent's first cousin are first cousins, once removed.
Your first cousin's child is your first cousin once removed. Once removed means one generation apart. Your cousin's grandchild would be your first cousin twice removed--two generations.
Yes, your "first cousin once removed" is either :your children's "first cousin twice removed" -- if your "first cousin once removed" is the first cousin of your parent, oryour child's "second cousin" if your" first cousin once removed" is the child of your first cousin.
The children of your first cousin twice removed are your first cousins, thrice removed - or three times removed.
First Cousin, twice removed.