Disclaimer: I don't own sonic the hedgehog. I only own Jerry-su the Echidna. So Knuckles doesn't have a son.
Jerry-su: A new guardian
`'Welcome home!" Knuckles said as he opened the door to his new house. Along followed Julie-su and her new son, Jerry-su. He was purple, (like his mom)with hair coming from the top of his head, (like his mom)but this hair was black and spiky and covered one of his eyes.

Knuckles put down the suitcases and took Jerry-su from his wife's arms. Then he set Jerry-su on his shoulders. "I think Jerry-su and I are gonna take a walk," Knuckles said as he walked back outside.
`'Bye!"
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Later, Knuckles stopped by the riverbank and set his son on the ground. He watch as Jerry-su crawled towards the river and dip his hand up and down in and out of the water. Knuckles put Jerry-su back on his shoulders and continued walking.

Much later, Knuckles arrived in front the Master Emerald. He smiled and looked at Jerry-su on his shoulders. "You see Jerry-su," Knuckles said smiling. "One day you will get to be the new guardian. Then suddenly, the Master Emerald started to glow and there was a sudden quake. "But how is there a earthquake on a floating island?" he mumbled. Then suddenly, (again)the Master Emerald started to glow a strange glow. A bright light shot from the Master Emerald and hit Jerry-su's forehead. When the light cleared, a crystal was revealed on Jerry-su forehead.

"Oh man what is that?" yelled Knuckles. He reached out to touch the crystal. "Aaaah!" Knuckles screamed as he was seriously burnt by the crystal. He stood back up and reach in glove and pulled out a pair bandages. Knuckles placed the bandages on his sons forehead in an X formation. "Well that'll do for now."
To be continued...