When you ask, How many brothers or sisters have you got?
Are there a word to englobe brothers an sisters?

Question

Answer

The word you want is "siblings".  How many siblings have you got?

You probably meant to say "encompass" or "include" when you said "englobe". ;)

Answer

How many children do your parents have? / Are you the only child in your family?

Answer

Siblings is the word, but it's still probably more common to say, "Do you have any brothers or sisters?" or "How many brothers and sisters do you have?"

Answer

How many siblings do you have?

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