While cousin marriage is legal in most countries, and avunculate marriage is legal in many, sexual relations between siblings are considered incestuous almost universally. Thus, many cases of sibling incest, including accidental incest, concern siblings who were separated at birth or at a very young age.

Is it normal for siblings to date?

No, and I have never known any siblings who have. Romantic and sexual relationships between siblings or other family members is called incest, and if one of the people involved are under the age of consent then it is illegal because its illegal for an adult to date a minor.

What is the love between siblings called?

Incest between siblings is most often short-term innocent sexual experimentation by children, but has been an intentional practice among some historical ruling families.

What do we call brothers wife?

sister-in-law sister-in-law the wife of your brother. The husband of your sister is your brother-in-law.