Tails is a boy, not a girl, so no he's not his sister :P He's more like his surrogate brother.
Tails
no tails is sonic's sidekick
yes she is pink not blue
No. Sonia is Sonics sister in Sonic Underground
Sonia is Sonics sister in Sonic Underground
Black is Shadow, Red might be Knuckles, Brown is Tails, Blue is Sonic
manis the hedgehog is sonics brother. he also has a sister named sonia. if you wanna see them they're shown in sonic underground
They were.. canceled.... Xo lol
Sonic`s best friend is Tails.But in the Sonic The Hedgehog and the Adventures Of Sonic The HedgehogIt was both Sally and Tails.Knuckles, and Tails
The Sonics ended in 1968.
The Sonics was created in 1960.
nope he has no brother or sister but he thinks of sonic as a big brother