This is not a genuine quote from the former president’s mother. […] It appears that this quote was created and exists solely for the purpose of this meme. […] To sum up, there is no evidence whatsoever that the former president’s mother called him “an idiot with zero common sense.” We therefore rate this claim “Unfounded.”

https://www.snopes.com/fact-check/trumps-mom-call-him-idiot/