Child means a child who bears any of the following relationships to an employee, the employee's spouse, or the employee's domestic partner:
(1) A biological child;
(2) An adopted child;
(3) A stepchild;
(4) A foster child;
(5) A child for whom a judicial determination of support has been obtained; or
(6) A child to whose support the employee, the employee's spouse, or the employee's domestic partner makes regular and substantial contributions.