Correct

同母异父

/ tóng mǔ yì fù / 
Strokes

Definition

(of siblings) having the same mother but different fathers/half (brother or sister)

Example

As a Verb

(of children) be born of the same mother but a different father

1
Tóng
同
mǔ
母
yìfù
异父
xiōngdì
兄弟

stepbrother; half brother

2
Tóng
同
mǔ
母
yìfù
异父
jiěmèi
姐妹

stepsister; half sister