(b) Definitions. For purposes of this section—

Child means a natural or biological, adopted or step child.

Code means the Internal Revenue Code.

Family size means the number of persons counted as members of an individual's household. In the case of determining the family size of a pregnant woman, the pregnant woman is counted as herself plus the number of children she is expected to deliver. In the case of determining the family size of other individuals who have a pregnant woman in their household, the pregnant woman is counted, at State option, as either 1 or 2 person(s) or as herself plus the number of children she is expected to deliver.

Parent means a natural or biological, adopted or step parent.

Sibling means natural or biological, adopted, half, or step sibling.

Tax dependent has the meaning provided in § 435.4 of this part.