맞으세요? means "Is it correct?" 어머니, 제 어머니 맞으세요? Mother, Is it correct that you are my mother? 맞으세요 is composed of 맞(다)+으시+어+요. 맞다 : be right, be correct 으 : added syllable for easy pronunciation after consonant ending syllable 시 : ending prefix used for honor the subject 어 : ending suffix in colloquial language 요 : ending honorific suffix in colloquial language

Full sentence "어머니, 제 어머니 맞으세요? "

We need the full sentence, the meaning changes a lot depending on the context and the phrase. :)