If she is hot, not a problem
something
The daughter of your husband's brother is his (and your) niece. Her daughter is his (and your) great niece.
no you have to say: my husband, my daughter and i ....
The daughter of your husband's brother is his (and your) niece. Her daughter is his (and your) great niece.
Your daughter's husband is your son-in-law.
The wife of a husband is referred to as the mother-in-law to her daughter's husband. In this relationship, the daughter's husband is the son-in-law to the wife. Thus, the connection can be summarized as the wife's relationship to her daughter's husband being that of a mother-in-law.
The daughter of your husband's brother is your niece.
Your daughter's husband is your son-in-law.
Your husband's cousin is not related to you. His/her daughter is not related to you either.
You have your daughter. You can let go of your husband and live your life and be happy along with your daughter. Life is never meaningless. There's always something or someone that gives meaning to life for us.
Your sister's daughter is your niece. Your niece's husband is not related to you.
my cousin's husband