Just like all the other cool characters Dic made for the sonic TV shows, they were removed. (If you really like them, then I can relate. scratch and grounder were just as cool!)
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Sonia was Sonic's (and Manic's) sister in Sonic Underground. She did not appear in any games.
Manic and Sonia are Sonic's brother and sister in Sonic Underground only.
They only appear in sonic underground
Only from Sonic Underground, but it's not canon. Manic and Sonia are his siblings.
Yes, in Sonic Underground he has a sister named Sonia. In the show Sonic is a prince and has a brother named Manic.