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You decide to play it smart, you try to grasp just how the device changes the world by comparing your old and new memories.
Upon fusing Amelia with Lucy and making Lucy the "dominant life", Amelia ceased to exist, her family still lives where they did but now they have one daughter less. Also with Amelia gone you've never actually visited the place, only seen it in passing. As for Lucy's family, one of the parents is now asian to explain their daughters ethnicity.
You gather that using the device to somehow increase her social status will likely affect you too if you make her "dominant". If you make the other party "dominant" it will be as if you never had a big sis but you won't be physically affected.