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Your sister-in-law is either the sister of your spouse or the wife of your brother.

The parents of the sister of your spouse are also the parents of your spouse and so are your mother-in-law and father-in-law.

The parents of the wife of your brother are not related to you.

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13y ago
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10y ago

For a female grandchild to your sister/brother: great niece

For a male grandchild to your sister/brother: great nephew

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Wiki User

12y ago

He would be your brother-in-law.

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Q: What relationship are your grandchildren to your sister?
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Related questions

What is the relationship of your sister to your grandchildren?

Great aunt


What is my relationship to my sister great grandchildren?

Great grandniece or great grandnephew


What is the relationship of my grandchildren to my sister's grandchildren?

They would be cousins to some degree. They are 2nd cousins.


What relation is your grandchildren to your sister?

The common ancestor is your parents. Your children and your sister's children are first cousins. Your grandchildren and your sister's grandchildren are second cousins. Your great-grandchildren and your sister's great-grandchildren are third cousins.


Are a sister's grandchildren her sister's grandchildren?

No, they`d be the second sisters great nieces and nephews


What is the relationship name for my brother's relationship to my grandchildren?

You brother is your grandchildren's great uncle or granduncle.Your grandchildren are your brother's grandnieces and grandnephews


How do you spell grandchildren?

The relationship term is usually hyphenated "great-grandchildren" (grandchildren's kids).


What relationship are your grandchildren to your brothers grandchildren?

they would be second cousins


What is the relationship between your aunt's grandson and your father's grandson?

Your father and your aunt are siblings (brother and sister) The grandchildren of siblings are second cousins to each other.


What relationship do your grandchildren have with your grandniece?

Your grandchildren and your grandniece are second cousins to each other..


How are your children related to your sister's children's children?

Your sister's children's children are her grandchildren.Your children and your sister's grand children are first cousins, once removed.Your grandchildren and your sister's grandchildren are second cousins.


What is my sister's relationship to my granddaughter?

Your sister is the great-aunt (also written great aunt) of your granddaughter.