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The Grimm brothers, Jacob and Wilhelm, had six siblings. They were the eldest in the family.
siblings means brothers and sisters. It appears the application form is inquiring about how many siblings (brothers and sisters) you have.
he has brothers and sisters
2 brothers
he had no siblings
He has 3 younger brothers
it means how many brothers and sisters you have
He had 5 siblings, 2 brothers and 3 sisters
He had 8 siblings. (I do not know how many brothers and sisters).
2 brothers (:
She has two younger brothers.
He has 3 younger brothers