Father or adoptive father.
Mother or adoptive mother
Grandfather or grandfather-in-law, meaning the subsequent husband of the child's natural grandmother, i.e., stepgrandfather or adoptive grandfather
Grandmother or grandmother-in-law, meaning the subsequent wife of the child's natural grandfather, i.e., stepgrandmother or adoptive grandmother
Great-grandfather or great-great-grandfather
Great-grandmother or great-great-grandmother.
Stepfather, but not his parents.
Stepmother, but not her parents.
Brother, brother-of-half-blood, stepbrother, brother-in-law or adoptive brother
Sister, sister-of-half-blood, stepsister, sister-in-law or adoptive sister
Uncle or aunt, of whole or half blood.
Uncle-in-law or aunt-in-law.
Great uncle or great-great-uncle.
Great aunt or great-great-aunt.
First cousins, nephews, or nieces.
Iowa Admin. Code r. 441-75.55