stepbrother

Stepparent's son (parent's stepson).

My stepbrother is a good person.

half-brother

Male that has one parent in common with other living beings.

My half-brother is a good person.

stepparent

Parent's spouse (non-parent).

My stepparent is a good person.

half-sibling

Living being that has one parent in common with other living beings.

My half-sibling is a good person.

stepfather

Parent's husband (non-father).

My stepfather is a good person.

half-sister

Female that has one parent in common with other living beings.

My half-sister is a good person.

adopter

Human beings who adopt other human beings.

My adopter is a good person.