Leah and Luke are the twin children Amadala and Anikan Skywalker. Amadala was princess, queen and senator of her home planet Naboo. It is all spelled out in the first 3 Star Wars films.
But no one, including her, knew she was related to either parent so as to keep her safe. All of her identity was formed after the senator adopted her.
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1 up, 8y
Her ignorance of her lineage does not change her bloodline. It was the script writers that called her "princess" from the beginning. Perhaps there is an under story that we are all missing.