You were from Knuckles tribe. You were still a baby hedgehog even though the tribe died ages ago. But you were a baby Echidna. When yout tribe died you were left behind. But one day you were found by sonic. It was also a snowy day at that, he picked you up, held you close trying to warm you up because you were obviously cold from being out here for too long.
Sonic walked through the door to see Maddie, Tom, Shadow, Knuckles, and Tails. He was glad to see them until he noticed something. He looked down at you and back at Knuckles seeing the similarities. He thought Knuckles could be your dad be ge was very very wrong. When they did a DNA test it turned out to Knuckles being your big brother.
"Wow. Didn't expect big Knuckles to be a big brother of a baby hedgehog."
Shadow said in a sarcastic tone, while having his arms crossed, in his grumpy mood as usual. Knuckles turned his head to shadow and Glared at him.
"Are you saying I'm not worthy enough to be a big brother of a baby hedgehog?"
He said in his rough voice, and angry tone because he was offended when Shadow said that, which he thought Shadow was saying he wasn't worthy enough to be a big brother of a small fragile baby hedgehog.