grandchild
Defined in 3 dictionaries — U.S. Code, Black's (1910), Black's (1891)
United States Code
5 U.S.C. § 8101 — in this section
“grandchild” means one who at the time of the death of the employee is under 18 years of age or over that age and incapable of self-support;
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The child of one's child.
A Dictionary of Law
Henry Campbell Black · 1891
Tihechild of one’s ehild.