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Questions & Answers about Haben sie Geschwister?
Why does this sentence start with Haben instead of sie?
In German, you form a yes/no question by moving the verb to the very beginning of the sentence. So, sie haben Geschwister means 'They have siblings', but Haben sie Geschwister? means 'Do they have siblings?'. Notice that German doesn't use helper words like 'do' or 'does' to ask questions.
Could sie in this sentence mean 'she' instead of 'they'?
No, and the verb is the clue! If the sentence were about 'she', the verb would be hat (Hat sie Geschwister?). Because the verb is the plural form haben, we know sie must mean 'they'. If you wanted to ask 'Do you have siblings?' using the formal 'you', it would sound exactly the same but be written with a capital letter: Haben Sie Geschwister?.
When do I use haben for plural subjects instead of habt?
Use haben for sie (they) and wir (we). Use habt only for ihr, which means 'you all' (the informal plural 'you'). If you wanted to ask a group of friends if they have siblings, you would say: Habt ihr Geschwister?.
Why is there no word for 'any' before Geschwister?
Just like in English, German often drops articles before plural nouns when talking about things in general. You don't need to add an extra word for 'any' to make the sentence sound natural. You are simply asking 'Do they have siblings?'.