who is my next of kin if i am single
Next of kin A person's next of kin (NOK) is that person's closest living blood relative or relatives. Some countries, such as the United States, have a legal definition of "next of kin". In other countries, such as the United Kingdom, "next of kin" may have no legal definition and may not necessarily refer to blood relatives at all.
Sibling-in-law One's sibling-in-law is one's spouse's sibling, or one's sibling's spouse. By gender, this is specified as brother-in-law for one's spouse's brother, one's sibling's husband, or one's spouse's sibling's husband, and sister-in-law for the one's spouse's sister, one's sibling's wife, or one's spouse's sibling's wife.[2]