(i)
For purposes of this section—
(1) mail matter, directed to a specific address covered in the order of the Postal Service, without designation of a specific addressee thereon, shall be considered as addressed to the person named in the Postal Service’s order; and
(2) the term “children” includes natural children, stepchildren, adopted children, and children who are wards of or in custody of the addressee or who are living with such addressee in a regular parent-child relationship.