Atticus, unlike the other fathers, is older and abstains from many of their activities.
Atticus, unlike the other fathers, is older and refrains from engaging in many activities they typically do.
To rephrase the sentence "Atticus is older than the other fathers and does not do many of the things that they do," you can say: "Unlike the other fathers, Atticus is older and doesn't engage in the same activities as them."
