Need help debunking pseudoscience (EM and Gravity related)

Hey everyone, thank you so much for your time. I'm not a physicists by any means although looking to eventually become one possibly in the future since I love science in general. I'm really new to the forums so I hope this is the correct place for this thread! Anyways, to the topic at hand. One of my family members has run down a rabbit hole of conspiracy theories and pseudoscience and does not believe gravity exists. His evidence for such an outlandish claim is a blog by a user called Zete

That's word salad. Science - physics especially - quantifies effects. It's not enough to spout some technical jargon. One needs a mathematical model that predicts behavior. Any notion that gravity can be replaced by electrostatics is trivially debunked, because there's no way to get an always-attractive force between more than two bodies. We orbit the sun, sure, but the moon orbits us while orbiting the sun. Pick a charge for the sun and the earth, and from the known orbits, mathematically

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