First degree kin would be your children, and, if no children then parents. Click on the links below for Charts of Degrees of Kinship.
His legal spouse and children would be his next of kin.
usually the next of kin would be a child, if no children than a sibling would be considered.
The mother AND the father are a child's next of kin. Next of kin is determined by legal adoption, marriage and blood. If a child's parents are deceased their next-of-kin would be their siblings by blood or by legal adoption.
The legal succession of next of kin in Texas is the kin that is closest as related by blood. Next of kin becomes the heirs of an estate when there is no will or a will that is contested in probate court.
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.
His wife is his next of kin for legal purposes.
Her heirs would be her next of kin or whoever she names in any will.
If he is still alive, your grandfather is the legal next of kin to your grandmother. Failing that, her children are her next of kin. Does she have living siblings? Those are also closer kin than her grandchildren. Failing that, it gets more complicated. We all have different families with different relatives.
No. 'Next of kin' is a legal category. See related question link below.
Generally, next of kin for legal purposes would be the spouse. If there is no spouse then the three biological children of the decedent would have equal standing as next of kin. However, laws vary so you should check the laws of intestacy in your particular jurisdiction.
The mother or father or legal guardian of the sisters. if there is no guardian the sister is next of kin.
Generally speaking, if the patient has children (or a spouse and children), they are the legal next of kin. If no children (and no spouse), the parents are the next of kin.