Asking about someones family: Asking if someone has brothers or sisters

💬 兄弟 (kyōdai) is written with "older brother" and "younger brother", but it covers sisters too, so it's the safe word for siblings in general.

💬 For people and animals, "have" is います "there is/exists", not あります, which is for things. Swap the noun to ask about other family: 子どもがいますか "Do you have children?".

💬 は here is said (wa), not (ha).

🇯🇵 Asking about siblings is a normal, friendly small-talk question in Japan, and adding さん to the person's family name keeps it polite.

💬 Japanese splits siblings by age: 妹 (imōto) is only a younger sister, and an older sister is 姉 (ane).

💬 The count goes after the person, right before います: 兄が二人います works the same way. 一人 "one person" is said (hitori) and 二人 (futari), not with the usual number readings.

💬 Despite the translation, this isn't doubt; it's an "oh, I see" that keeps the conversation going. Said with falling pitch it sounds natural, not surprised.

🇯🇵 Use 妹さん for someone else's sister and plain 妹 for your own. Adding さん to your own family members sounds odd, like calling yourself by a title.

🇯🇵 おいくつ is the polite way to ask age, fine for children and adults alike; the plainer 何歳 (nansai) "how many years old" is mostly used with kids themselves.