Daughter in law(
A case for what? Please explain.
If a man has a daughter from a revious marraige, that daughter is the step-daughter of the second wife, and the second wife is the step-mother of the daughter.
Yes
Your cousin's wife is not related to you or to your daughter - unless your daughter marries their son or your wife is related to your cousin's wife.
Your husband's step-daughter could be your daughter.Your husband could also have a step-daughter who is the daughter of a previous wife from her prior marriage to someone else. In that case, his step-daughter is not related to you, unless you adopt her.
Your sister-in-law is either the wife of your brother or the sister of your wife.A niece of the sister of your wife may be your daughter. If not she could be your wife's niece too, as the daughter of one of your wife's other siblings. A niece of the sister of your wife could also be the daughter of your wife's sister's husband. In that case, she is not related to you.The niece of your brother's wife could also be yourdaughter or the daughter of another of your siblings, since your brother's wife is your daughter's aunt. If the niece of your brother's wide is the daughter of the wife's sibling, then she is not related to you.
You will have to get in contact with your lawyer who will then file a case against your wife, and so prevent her from taking your son out of the country.
If your daughter is also your wife's daughter, your daughter and your wife's first cousin are first cousins, once removed, otherwise they are not related.
Your wife's nephew is also your nephew. His daughter is your (and your wife's) great niece.
No, they can not make a spouse testify against a spouse.Added: But, they are not prevented from doing so, if THEY wish.
Demeter was the goddess of harvest. Her daughter is Persephone, who was taken be Hades against her will to the underworld to be his wife, and is the joy of her life.