"Mi mamá y mi papá son maestros."
Translation:My mother and my father are teachers.
I tried that but I guess its just something Duo Lingo likes to bother use with.
The reason it didn't accept that is because you were paraphrasing.
My parents - Mis padres
My mum and my dad - Mi mamá y mi papá
I said "my mama and my papa are teachers" and papa was marked incorrect but "dad" was marked correct. Where I grew up, people are as likely to say "papa" informally as they are to say "dad". I don't this should be marked this way.