A/N (Edited)

Dominic lost his mother at a very young age. Since then, his father and he have been very close, up until Dominic's 10th birthday.
Dominic's father, Paul, wanted to surprise Dominic with a sister, Molly, 5 years old. Paul adopted Molly, of course, secretly. But, ever since Molly joined their family, Paul never once took time out of his day to talk to Dominic.
What if this affected Dominic more than Paul intended?
What if this choice causes him to lose another person?