Friend requests on FB: Are email notifications the default?

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I accidentally sent a friend request to someone I DID NOT WANT TO. (my father whom I have very bad relations with and in a moment of weakness was looking at their page... anyway i am so stupid!!!!!!!!) I have cancelled the friend request, blocked them, then unblocked them!

Will they still get a notification that I sent them a friend request or is it okay since I cancelled it?

This is really important ! Thanks for your input, Seriously stressing! What are the chances that they would know? are email notifications default? It was like 1am when i sent it by accident. ACK.
Should I just keep then blocked for a few weeks until it blows over? This is a personal issue.