Disclaimer: The stories are mine. All the rest - characters and locations you've heard of in TV shows, movies, books etc - belong to their respective owners.
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Beru was born as a daughter of the dunes, a child of the desert that never had the honour to actually live among the great sand fields that so dominate the nature of Tatooine. She was proud to look back to a long family history going back to the times before the Second Colonization. Or at least, that is how the Tusken would have described the time period in question. If one had asked any other person on the planet they would tell you that Tatooine was only colonized once and that even this one attempt at terraforming didn't go as well as expected.
For you see, nobody but the Tusken remembers that Tatooine was just an empty lifeless rock before they came to settle there. The historians and scientists of the old Republic were often baffled that a harsh environment like Tatooine's dune sea would be gentle enough to allow great civilizations to build their temples, but they never found a reason not to believe said civilizations were not already dead and long gone from the planet. But the old people of the sand were never gone. They had merely decided to leave their old cities to crumble and live the way their ancestor had done before settling Tatooine. They found it better to live from the land than to ruin the world with their useless monuments. That the Tusken were an inherently violent and nomadic culture was only a plus to this decision.
Not all Tusken left the cities though. A small number of them stayed behind to protect the history hidden away behind stone walls. And when many years later the colonists came with their space ships and water evaporators and technology that hated the sand as much as its creators did, well, the city dwellers did what all Tusken do best. They changed with the environment and became a part of the new colony that was built.
And so it came that the once proud Tusken heritage of the cities dilluted itself to mere fairy tales that parents tell their suckling young. Nothing more than fancy ideas hidden behind the veil of obscurity that had apparently always muffled the voices of the slave caste.
Until a child was born to a woman named Skywalker, a woman who would later be bought for the pleasure of a homestead patriach. Lars was the man's name and he fell hopelessly in love with his slave. So much in love that he cast aside the memory of his dead first companion, the mother of his only son, and married the woman. Many would call this a scandal as old Lars chose to make his dear Shmi a free woman before demanding her vows of fidelity. Just not done with slaves, they said. It has always been alright to fall in love with staff, but to free them before the marriage was simply outragious.
Beru understood this better than others. She loved her Owen dearly and knew he did as well, or he would not introduce her as his fiancé, but marriage was so far beyond her imagination that she hoped the question would never be asked.
In the short time Shmi Skywalker was the honest matriach of the Lars family, she told many stories to Beru. Stories about her son, the master pilot, who went out into to the galaxy to become a Jedi. Stories about her son, the dark dreamer, who swore to free all slaves come death or water. Stories about her son, the impossible gift, whom she had never told that he was the result of a short love affair with a Tusken raider lost in the city. And stories about the dark past of Tatooine, when the desert tribes were united under one name and their giant fleet travelled the galaxy in search for a new home. Shmi also told of the legend of the Vader, this great warrior destined to fight daylight for eternity until gentle dusk would touch his knife and teach him that night and day need not make war.
This one, Beru learned, was a particular favourite to Shmi's little Anakin. So much that he spent his whole fourth year of life with his head wrapped like a desert raider and play-acting all great deeds of this night-worshipping character. "You see," Shmi had said, "no child of the desert can follow the light. They love the shadows too much." It was no wonder that her child, or any child of Tatooine at all, would prefer a hero who chose to never walk under a sun's harsh glare.
Later, when Shmi was gone and she had had her first good look at Anakin Skywalker, Beru understood why Shmi would talk so fondly of 'her bright little darkling'. His life under the Jedi's tutelage had made the boy forget most of his heritage and he actually seemed to prefer sunlight to night now, but under all this was still the child who dreamed of becoming Vader when he grew up.
Beru liked Anakin. He frightened her to death sometimes, but still she liked him.
Then came the war and that was followed by the birth of an Empire.
And then a baby was given to Beru to look after.