we 've made the best for it, said Dave Dahl. We 've adjusted our lives, we 've changed our lifestyles. But we 've just got to be positive. Dave Dahl reminds himself that things could have been worse. Our family unit here in this house is five people, he says. Within an instant it could have been two. Arrianna in particular has taken on a number of duties, like cleaning the bathrooms and doing the laundry, that she says has taught her how to be a grown-up. Most of the time when my mom is in the hospital or getting surgeries, I have to step in and be the surrogate mother to my younger siblings, Arrianna explains. The family also includes another daughter, Brianna, age 11. And my dad is working a lot of the time so he kind of does n't have much time. It kind of teaches me to grow up some and how to be a grownup and what it's like. She adds it can get difficult once in awhile, but these days she simply reminds herself who she's doing it for. Now I kind of understand why I have to stand in and why sometimes I have to be the adult. Kim Dahl deals with PTSD, as well, and still sees a therapist twice a month. And while Arrianna no longer has therapy sessions of her own, occasionally she still struggles. Kim Dahl is among 122 victims and their families who 've filed suit against URS Corp., an engineering and construction firm hired by Minnesota DOT to conduct engineering