Question: is a sister in law considered immediate family

Answer: Yes, The immediate family is a defined group of relations, used in rules or laws to determine which members of a person's family are affected by those rules. It normally includes a person's parents, spouses, siblings, children, or an individual related by blood whose close association is an equivalent of a family relationship. It can contain others connected by birth, adoption, marriage, civil partnership, or cohabitation, such as grandparents, great-grandparents, grandchildren, great-grandchildren, aunts, uncles, siblings-in-law, half-siblings, cousins, adopted children and step-parents/step-children, and cohabiting partners.