The father of Missouri teen Kaylee Gain ruefully admitted that the road that led her to a fight with a school rival was paved with parental shortcomings. In March, a viral video showed Maurnice DeClue and Gain fighting, with DeClue getting the better of the punches and then slamming Gain’s head into the pavement. DeClue is facing an assault charge and a hearing to determine if the 15-year-old will be tried as an adult for her battle with the 16-year-old Gain. Clinton Gain said he and Kaylee’s mother, April Nordstrom, had drug addition issues during their daughter’s childhood, according to the …