Sister.
brother or sister
Mom and dad might be logical
A mistake.
A boy will typically call the daughter of his parents "sister." In a family context, "sister" refers to a female sibling, while he may also use terms of endearment or nicknames, depending on their relationship.
The daughter of your brother or sister is your niece.
You may say 'nisei.' 二世
Your son or daughter. Just because the child gets a new set of parents, doesn't mean that the birth parents cease to exist. Adopted children have two sets of parents and both parents will call that child theirs.
Call 911/ Contact parents or gardian. Or you can sit and look at her. *___*
You could call them as a brother/sister or as a cousin... If you're asking for yourself then good luck with that family.
An orphan is a child who has lost both parents.
Depends. Some children who have contact with both they're biological and adoptive parents refer to both sets as "mom & dad". So I would talk to both sets and ask what they feel comfortable as to what you should call you're biological parents.
you tell their parents or you tell the principle if you are at school or tell you tell an adult who has deal ed with this before