If you read Chapter 5, she actually comes from a broken home. I didn’t leave specific details, but she could have come from a family wrecked by divorce, or may have been illegitimate and raised by a single mother. Either way, I think having a sister would have thrown a wrench in that characterization.
I’m hoping to go into a bit more about her past in Chapter 8
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On a side note, and after discussion with Carp, I’ve added two tags - “mummah-candy” and “doting-bonnie”, to reflect the two new recurring characters who have been added to the Avocadoverse.