basically lissa's father had an affair at some point during her parent's marriage, which resulted in a baby. i was thinking it was during a rough patch and he hooked up with his high school gf or something. so her mother knew, but never told her (out of bitterness). her father died when she was 8 and that's when she and her mom moved back to bar harbor. her father was originally from maine, but somewhere outside of bar harbor. everyone kept the affair and baby a secret until her mother finally told her about a year ago. so these two would still be getting to know each other. i'm flexible with details if you want to change things to fit your girl's history