Only from Sonic Underground, but it's not canon. Manic and Sonia are his siblings.
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Sonic only has siblings in the non-canonical TV series Sonic Underground. He has a sister, Sonia and a brother, Manic.
Yes, Silver the Hedgehog does not have any siblings. In the Sonic the Hedgehog series, Silver is often portrayed as a lone hero from the future, working to prevent catastrophic events from occurring. His character is typically depicted as independent and focused on his mission, with no mention of any siblings in the official canon of the games or other media.
The anagram of sonic the hedgehog "sonic the hedgehog."
Adventures of Sonic the Hedgehog Sonic The Hedgehog(SatAM) Sonic Underground Sonic the Hedgehog The Movie Sonic X
Sonic the hedgehog is, as his name suggests, a hedgehog.