Hi esc, I would use the word "sibling" (a person's brother or sister): Jill and John are siblings Hope this helps
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
The last one is wrong because we are talking about one pair of siblings.
The middle one is also wrong cause first you Said sister's name than the brother's name and the sentence first say brother than sister.
The first one is correct cause it's talking about one pair of siblings,it first says sister than brother and their are no more mistakes