he dead of an atomic explosion
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No Scourge didn't, in comic it says Scourge killed Manic, but Scourge didn't.
Sonic has a brother (Manic) and a sister (Sonia).
It the same day as Sonic and Sonia's because they are triplets
Sonia was Sonic's (and Manic's) sister in Sonic Underground. She did not appear in any games.
Only from Sonic Underground, but it's not canon. Manic and Sonia are his siblings.