Which one doesn't belong

1.ingeniera, médica, programadora, periodista, hijastra

2.cunado, nieto, yerno, suegra, nuera

3.sobrina, prima, artista, tia, herman

4.padre, hermano, hijo, novio, abuelo

5.muchachos, tios, ninos, chicos, his

6.amiga, hermanastra,  media hermana,  madrastra

1. hijastra (the others are jobs and stuff)

2. nieto (this means grandchild the others mean inlaws)

3. artista (artist, the rest are about family)

4. novio (means boyfriend, the rest are family)

5. his (the rest are familial)

6. amiga (this means friend, the rest are step family or half family)

it would if you gave a bit of context with your question so that others could you..

add question for the answer