Smallville is no stranger to "Totally not a Metahuman" neighbors.
So! When Jonathan and Martha Kent one day turned up with a Baby, supposedly an at home birth despite the baby clearly being at least a year old and Martha have never had a baby bump, most of the town just went with it.
They assumed it was an Abandoned Baby situation, and the Kent's wanted to avoid all of the legal hurdles of adoption, so whenever asked they would say "Oh yeah, Martha definitely had a visible Baby Bump a few years ago." "Of course she had an at home birth, the town doctor will absolutely testify to helping deliver Clark." "Why does he look nothing like his parents? Genetics are weird and complicated, I'm a farmer, I don't study that shit, get off my lawn."
When they noticed that Clark was just a little stronger than most kids, they wrote it off.
When they noticed he could easily catch up to sprinting dogs when playing in the fields, they just praised him for his athleticism.
When one of them saw him jumping onto the roof of their house to get a Frisbee, they just told him to be careful.
Why were they so non-chalant about all of those things? Well because they had dealt with all that stuff and more a few years ago, when Mr Fenton and his daughter Ellie moved in.
It was practically the exact same situation, only in their case Daniel was there to help teach his daughter about how to use their clear Metahuman Powers. The Kent's weren't Metahumans, and before long they realized that they were out of their depth when raising a meta baby who could leap over a Barn in a single hop. So they went to Daniel for help.
And help he did, because in the following years they would attest to Daniel being the only reason they came out of Clark's childhood with their house intact.
He taught the boy how to control his strength so he wouldn't hurt others, how to restrain himself when he was excited so he wouldn't float off into the sky, and most importantly, how to keep it a secret when others not in the Know were around.
He told the story of how he and his daughter had come to Smallville, persecuted by the government and disowned by his own parents, forced to run away from everything he had ever known to keep himself and Ellie safe. It really made Clark appreciate his own Ma and Pa more than ever.
It also helped that he had "Cousin Ellie" to play with as a kid, since he always had to he careful around the other kids. It was honestly a relief to her as well, considering she could only ever play with her Dad or the Meta-Dog that visited their home once in a while.
Years later, when Clark was raising his own kid, he looked to his Uncle Daniel for guidance.
