Half-sisters sharing the same mother also have inheritance rights under the law.
Tips
usage
母异 appears in the compound 同父母异 or more commonly in 同母异父 (tóng mǔ yì fù — same mother, different father) and 同父异母 (tóng fù yì mǔ — same father, different mother). These are the standard legal and literary terms for half-siblings.
