3 month old kitten I’ve had for a month still being aggressive with my 7 year old cat and making her sad what do I do?

He won’t stop attacking her, is this normal? Or do I need to rehome? How long should I give it and what can I do to make my cat happier

submitted by /u/Ditzy_Panda
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from Pets https://www.reddit.com/r/Pets/comments/pyg4je/3_month_old_kitten_ive_had_for_a_month_still/