Student or Learner
1. Can you recollect how your brother reacted?
2. Can you remind yourself how your brother reacted?
3. Can you remember yourself how your brother reacted?
Is there any difference in meaning between 1 and 2?
Is 3 OK as well?
Sentence 1 is fine although it would be better to say "Can you recall..... or just "Can you remember"
Sentence 2 is not the same, nor is it logical; you can remind yourself to mail a letter, but you can't remind yourself about a memory (how your brother reacted)" remind" means to remember to do something not to recall to mind.
Sentence 3: You do not need the word "yourself" because "Can you remember" means you are the one remembering, so yourself is unnecessary.