二従兄妹の英語

an elder brother and younger sister

one's younger brothers and sisters

brotherly relation

a person's brother or sister

They are cousins.

person defined by family relation (person who is a sibling of a person)

of people born to the same two parents, the kinship relation of elder brother

They are a consanguineous couple.

a cousin once removed

They are cousins.

a child born to one's wife's siblings

a blood relationship of being one's cousin

the status of older half brother having the same father as his half sibling or siblings

The brothers love each other.

the child of one's brother or sister

one's nearest relations―natural guardians

The brothers are all alive.

the daughter of one's brother or sister

married cousins

uterine brothers―uterine sisters

I know both （the） brothers.

I have many brothers and sisters―（と言うよりも普通）―I am one of a large family―I belong to a large family.

a daughter of your brother or sister

a son of your brother or sister

true brothers―brothers german

one's elder brother by blood

The brothers are at variance with each other.

the relationship of being cousins

a sibling who is male

brotherly love―sisterly love