I have a couple cousins who seem to post every thought that goes through their heads. When I look at my feed I usually see at least a half dozen posts from each

I have a couple cousins who seem to post every thought that goes through their heads. When I look at my feed I usually see at least a half dozen posts from each of them. Almost all of them are meme stories they liked, comics they read, or some wordle puzzle they solved. Can I block them or unfriend them without them knowing? Family reunions might get a little more uncomfortable.