Answer:
1- La esposa de mi hermano es mi cuñada.
2- La hija de mis tíos es mi prima.
3- El esposo de mi hija es mi yerno.
4- Mi madrastra es la esposa de mi papá, pero no es mi mamá.
5. La madre de mi esposo es mi suegra.
Step-by-step explanation:
1- My brother's wife is my sister in law. That's cuñada in Spanish.
2- My aunt and uncle's daughter is my cousin. That's prima in Spanish. This means she is a female cousin. If it was a boy it would be primo.
3- My daughter's husband is my son in law. In Spanish this is called yerno.
4- My stepmother is my father's wife, but she's not my mom. In Spanish this is called madrastra. It's a term that's not so common nowadays. It has become obsolete. In general that person is called "my father's wife", or "my mother's husband" if it's the other way around.
5- My husband's mother is my mother in law. In Spanish this is suegra.