Cain (Harvest Moon: Tree of Tranquility)
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Cain is the owner of Brownie Ranch, father of Renee, husband of Hanna, and can often be found in the store area. He can give you helpful information when it comes to your animals, and will be the one to give you the Sickle.
You won't be able to meet Cain until after you've unlocked Brownie District. You can unlock it two ways; break the boulder blocking the path, or wait until Spring 28, when the path is automatically cleared for the Animal Festival. Because it will take a lot of work to smash through the boulder, you will most likely have to wait until the festival.