
it seems unrelated to the sentence "Do you have any brothers?"

It's a pun between 海豚/イルカ, dolphin, and いるか?, "is there?".

oh, ok, thanks for the explanation (i can't speak japanese at all, so that explains my first comment)

I agree with CK,
If you would want to, perhaps you could turn every Japanese sentence to a pun (like all the sentences with いるか to dolphins), but that's no good contribution, I think.
imo, if I'd wanted to have a sentence about dolphin brothers, I'd write it in katakana or kanji.
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