Manic and Sonia are Sonic's brother and sister in Sonic Underground only.
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Sonia and Manic, but thats only in Sonic Underground, in all other media he doesn't have siblings
Only from Sonic Underground, but it's not canon. Manic and Sonia are his siblings.
He has siblings within the Sonic Underground universe, Sonia and Manic. Due to this being an alternate universe, it is not canon to the game storyline.
Sonic does not have siblings in the main-canon, but in the old DIC cartoon, Sonic Underground, he has a brother named Manic and a sister named Sonia.
It depends on which sonic your talking about. In the comic they're still alive last i checked, but in the show it only talks about sonics mom who left sonic and his two siblings manic and sonia in three good homes. i forgot the reasoning, but i think she was still alive too. I will check for you and see.