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Your sister's husband is your brother-in-law. Your brother-in-law's brother is not related to you and neither are his children. But he is your sister's brother-in-law and his children are your sister's nieces and nephews.
Your sister's sister-in-law is either the wife of her brother or the sister of her husband.If she is the sister of your sister's husband, then her children are not related to your children.If she is the wife of your sister's brother (yourbrother), she is also your sister-in-law and her children are your children's first cousins.
Your dad's brother is your mom's brother-in-law. He is not related to your mom's sister or her children.
There nothing wrong in brother and sister taking a bath together. Yes They can wash each other and rinse the soap off. It a good way of caring for each other. Preteen and tenage age children can doe this also. It normal.
If your brother (or your sister) has children they are your nephews (males) and nieces (females).
A brother and a sister, both being children of the same parents, are siblings.
The children are both your cousins[uncle's children]and your nephew and niece[sister's children].
No here they are still brother and sister, but they do have a stepfather.
Your mother's sister's children are your 1st cousins.
No, Kris Letang doesn't have any children.
He would be your brother-in-law. To your children, he would be their Uncle.