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When you describe a person as being in love, that is an emotion, and the law does not prohibit emotion, which are free to feel. However, if that emotion leads the uncle in question to make sexual advances upon his niece, chances are that is a type of child abuse and is illegal - although the specific age of the niece in question is relevant. Generally speaking, consenting adults can have sex if they want to, although it is not always in good taste.
Of course. Issues? Not many if the relationship is non-blood related; for example, wife's sister's hot 26 yr old daughter.
A niece or nephew is the child of an aunt's or uncle's brother or sister. So the parents of the aunt/uncle and of the niece's/nephew's parents are the same people - their grandparents. The grandmother of the aunt or uncle is the great grandparent of the niece or nephew.
You're a Great Aunt to your nephew's son, who is your great nephew.
Unless there is something being left out, an "aunt inlaw" would be no blood relation. This should be legal.
a nephew's kid to his aunt's kids would be their cousin.
You are your nephew's uncle, or aunt, and his son's great uncle, or great aunt. Your nephew's son is your great nephew.
You granddaughter is a great great niece of your aunt. Your aunt is your granddaughter's great great aunt.
Your niece's son is your great nephew. You are his great aunt or great uncle.
Your nephew's child is your great nephew (if a boy) or great niece (if a girl). You are his or her great aunt.
Your aunt may be the sister of your father or mother, or your uncle's wife. In the former case, an aunt's sister could be another aunt, or could be your mother. In the second case, the sister of your uncle's wife has no direct relationship to you at all.
You are a great great Aunt (or Uncle) to the grandson of your Nephew.
Your brother's (or your sister's) son is your nephew and you are his aunt if you are a female or his uncle if you are a male.
Aunt.