BORN (obviously)
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According to the Sonic the Hedgehog Technical Files, Sonic was born on Christmas Island.
AnswerSonic the Hedgehog was born June 23rd ,1991
Planet Mobius
If you mean to say 'are sonic and shadow brothers', then the answer is no.Shadow was created by Professor Gerald Robotnik in an attempt to make an ultimate life form. Seeing as Shadow wasn't actually born, he cannot have a mother/father/siblings.
Sonic made his first appearance in a game in 1991. Sonic was born on day 162 of the year 3220 on the Planet Mobius