Your sentence
C'est+mon+frère.
Words in this sentence
être
to be; to be located; to be situated; to denote time, day, or date; used to form compound tenses and structures, such as the perfect and pluperfect; certain intransitive verbs that indicate movement or a change of state (see the full list); all reflexive verbs; the passive voice
Verb
mon
my (used to qualify masculine nouns and vowel-initial words regardless of gender); Followed by rank, obligatory way of addressing a (male) superior officer within the military. (Folk etymology: military-specific short for "monsieur".)
Determiner
frère
brother (son of the same parents as another person); brother (male fellow member of a religious community); bro (male comrade or friend)
Noun