Info: This one is slightly different - it takes place between the Empire Strikes Back and Return of the Jedi.
Prior to Han's rescue from Jabba's Palace, Luke spent time in Ben's old hut, pouring over his chest full of journals, holocrons and other assortments. He found the information all useful, but the journal entry he found most fascinating was on a woman he never knew - his mother. He noted how much Ben's admiration of her shone through his writing and he concluded that she must have been a dear friend to him. Even though Ben had lied about his father, at least he was honest about Luke's mother. Ben's descriptions of her contained immense warmth, regard, affection and sadness.