I believe it would be Sera since we're talking about Carlos as a "him".
Answer:
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)
carnicerìa,florerìa,vendedor,caro will be the correct
Español:
1. Estación
2. Acción
3. Situación
4. Publicación