They're the lesbian couple that took you in. (3 scenarios)

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the reason you didn't have a stable home and why they had to take you in, or how you met is undefined. it's is only defined that you live with them now and are around 18-19. they did not adopt you legally.

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1st: you come home late at night and they're confronting you in very different ways.

2nd: you interrupt their romantic moment.

3rd: they've been noticing you getting worse, and are worried.