Khateeb Al-Baghdaadi (rahimahullaah) said:

”There was no one amongst the people of  hadeeth who (merely) defended his father, brother or son in the knowledge of hadeeth. Ali Bin Abdillaah Ibnil Madeenee was an Imaam of Hadeeth in his era, but not a single word has been seen from him in (declaring) his father a strong (or good) narrator; rather it is opposite that has been seen.”

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[ Sharaf Ashaabul Hadeeth (page:41)]