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Maeve's mother passed away due to liver cancer.
This illness is extremely dangerous, and from diagnosis to her passing, it was only six months. Less than a year after she passed, to be precise, seven months and five days later, Leo Lester quietly married Diana Dalton. Less than six months after their marriage, Diana gave birth to their first child.
In other words, less than three months after Maeve's mother passed, Leo had gotten Diana pregnant.
Maeve didn't believe that at over thirty, Diana could conceive so easily, so she suspected that Leo had been secretly involved with Diana while his first wife was still alive.
This is also the direct reason for Maeve's continuously strained relationship with Leo – she believed he disrespected his wife, that even while his wife was sick from exhaustion after building everything together with him, he still had the heart to get involved with Diana.
