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Your uncle through marriage is the husband of your aunt, the sister of your father or mother. All of your aunt's nieces (the daughters of her siblings) are also his nieces. So you (if your are female) and our sisters are nieces of your uncle through marriage, as are the other daughters of the siblings of your parents.
Also, your uncle through marriage has nieces who are the daughters of his bothers and sisters. They are not related to you because you do not share any ancestor with them.
What else can I help you with?
What relation am I to my niece's husband?
You are an aunt/uncle-in-law! Congratulations!! You really are; because you're an aunt/uncle to your niece you are now an aunt/niece by marriage to her husband.
What relation is your wife's brother' daughter to you?
There is no direct connection, only one of marriage. She is your niece. You are her uncle.
What would your relation be to your daughter's nephew by marriage?
Your nephew's daughter is your great niece and you are her great Aunt (or Great Uncle).Correction:Your nephew's daughter is your grand niece. You are her grand aunt or grand uncle.
What relation you have with your sisters daughter?
Your niece in-law, or your niece by marriage.
What relation is your daughter to your uncle?
Your daughter is your uncle's grand niece.
What relation is your great uncle's wife's great niece to you?
Your great uncle's wife would be your great aunt by marriage. Her great niece could be you if you are female. If not, she could be your sister, your first cousin or your second cousin. She could also be unrelated to you.
What relation is a man's niece's son to him?
uncle and nephew
What relation are my sister's children to me?
You are their aunt or uncle and they are your niece or nephew.
What relation is your husband to your niece's son?
Your husband is great uncle to your niece's son (your great nephew).
What relation am I to my niece's granddaughter?
You are the great-great-aunt/uncle to your niece's granddaughter. This means that your niece's granddaughter is your great-great-niece. The term "great-great" signifies that there are two generations between you and your niece's granddaughter.
What relation are you to your father's brother's?
Your fathers brothers are your uncles. You are their nephew, or niece.
What relation are you to the grandson of your niece?
Great great aunt/uncle. To your niece, you are the aunt/uncle, to her child you would be the great aunt/uncle. So you would then be the great great aunt/uncle of her child's child (her grandson)
