We are Peter's brothers.
The plural for Peter is PETERS`
The correct phrase is "your brother and sister are correct." This is because "brother and sister" is a plural subject, and it requires the plural verb "are" instead of the singular "is." Therefore, you should use "are" to agree with the plural subject.
Andrew was Peters brother.
his name was peters
Brothers is the plural form of brother.
The plural form of phrase is phrases.
Brother's is singular possessive. Brother is singular and brothers is plural.
he has a brother named Richard
The plural is brothers.
The plural form of the noun brother is brothers.The plural possessive form is brothers'.Example: The brothers' business is really doing well.
The noun 'brother' is a singular noun.The plural noun is 'brothers'.
The possessive form for the singular noun Peter is Peter's.Example: I met Peter's parents at the picnic.The possessive form for the plural noun Peters is Peters'.Example: The two Peters' fathers are brothers.