I have this six months old cat who's adorable but crazy lol

He's the offspring (Chubbs) of the daughter (Luna) of my female cat (Mara), which I gave to my step daughter but now Chubs won't stop suckling on Mara and she doesn't stop him from doing it. Obviously she doesn't produce milk.

How do I stop it? To clarify Mara is the mother of Luna Luna is the mother of Chubs Chubs suckles on Mara.

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