Boyfriend sleeps in the same bed with his sister, is it acceptable?

Yesterday my bf told me he was sleeping besides his sister so he couldn't stay up too late. Then I asked him whether he was in a different bed, but he said : in the same bed.

I felt really upset about that but he didn't seem to be bothered about it. Am I just overly reacting?
Acceptable
Not acceptable
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His sister is ten. They were just at home and his sister didn't want to sleep by herself so she went to his bed..
Boyfriend sleeps in the same bed with his sister, is it acceptable?
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