The mother seems more upset about this than the father. Surviving twin says "We were basically one person". He died in his brother's arms while he was trying to save him.
Other people have posted links to the father's statement, where he says he has already "forgiven" the killer, that he "just made a bad decision". That's how describes his fucking son's murder, a "bad decision". Interestingly, the dad isn't present for this interview, and I have to wonder why- do we know the status of this family? Divorced with the boys in mom's custody?