If they have a biological relative then no, a brother is a closer relative than an adoptive father is. Legally though, if you are the only guardian/ relative then you will be next of kin.
Yes. The next of kin has adopted many children.
yes, children through adoption are legally the same as children by birth.
No. Although next of kin is an inexact term depending on the context, a fiance is not next of kin. An unmarried adult's (who has minor children) children and parents would be considered next of kin. See related question link. A fiance would have no legal rights unless the decedent had executed a document granting legal authority.
usually the next of kin would be a child, if no children than a sibling would be considered.
In most cases the next of kin would be the spouse. If there is no spouse, children would be considered.
His wife is his next of kin for legal purposes.
A partner is considered next of kin only if they are a spouse. In the United States the order of precedence after spouse is children, parents, grandchildren, then siblings.
John R. Snarey has written: 'DEVELOPMENT OF SOCIAL-MORAL REASONING AMONG KIBBUTZ ADOLESCENTS' 'How fathers care for the next generation' -- subject(s): Father and child, Fathers, First-born children, Longitudinal studies
Esme was next, then Rosalie. then Alice and Jasper found them. Then (spoiler for Breaking Dawn) Bella and Renesmee.
In most every jurisdiction the six children would be considered next-of-kin. You can check the laws in your state at the related question link provided below.
Whether or not a step daughter is next of kin depends on a variety of factors. If there are no other closer relatives, then it could be the case.
If the girlfriend can be considered his common-law wife and the state where they reside recognizes the validity of such a marriage, she can claim next of kin.