Older cat has been friendly with new kitten for months but is now suddenly hostile

I mean overnight. No idea. They would cuddle and groom each other but now the older one hisses and swats when kitten is close. What to do?

submitted by /u/shockingdevelopment
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from Pets https://www.reddit.com/r/Pets/comments/ljhhh5/older_cat_has_been_friendly_with_new_kitten_for/