Keira Shaylee Hammond is the first born to a whole new generation of Hammonds - three eventually followed. However, something unexpected happened - as she grew up, it was clear that the first Hammond of that generation was a Squib.
This set her apart from her siblings and isolated her in the household growing up. Since she didn't need magical education and could take care of herself and her own studies, her parents favored handling their younger children and having her serve as a pseudo-babysitter for them. She didn't mind the role, but this caused her to rebel against her parents in her early teenage years.
The once squeaky clean A+ student began skipping school, getting in with bad crowds, talking back to her parents and pretty much everyone else (except her siblings), and becoming an overall menace. No matter what her parents tried, they didn't seem to get through the teenager. The one who did was the sister closer in age, whom took it personally when Keira was verbally assaulting their parents.
This resulted in a very big argument, culminating with Keira in tears, openly admitting that she just wanted her parents to notice her doing something past getting good grades - that she didn't feel that she belonged in the family due to the lack of powers, and that her brain was the only thing they ever saw in her. This was not true and the sister made her realize this. From then on, Keira made an effort to consciously curb at least some of her mindset, and got closer to her sibling over time. Her effort was so great she wound up becoming the student council president in her high school.
This wound up having a very negative impact in Keira's life. Struggling to break free, she made a series of horrible decisions that would severely impact her life - she moved out of her home early, ending up pregnant very soon after, bearing the child of her best friend. Despite not loving him, she agreed to marry. After the shotgun wedding, they had another child, which didn't work to save their marriage. She then concluded her degree while her parents handled the children, and started working from sunrise to sundown.
Guilt-ridden and not wanting their children to grow up in a loveless household, she wound up getting a divorce on amicable terms. At that point, she was 25 years old, was divorced, and had two children to raise. Both parents elected to let them stay with the Hammonds as they had quite a bit of experience with the matter, while they focused on their jobs - to her surprise, her oldest sibling offered to move in so to help with rent and with setting up Keira's show. While she had most of the latter down and ready to go, she was strapped for cash, and thus reluctantly agreed to this suggestion.