Half-brother, half-sister
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Persons who have the same father, but different mothers; or the same mother, but different fathers. Wood v. Mitcham, 92 N. Y. 379; In re Weiss' Estate, 1 Montg. Co.. Law Rep'r (Pa.) 210.
Defined under Half in Black's Law Dictionary.