In the new episode "Tradition!," Robin (Sarah Wayne Callies) gamely makes an attempt to mark the fall holidays, knowing that she can't hope to compete with memories of how Scott used to handle everything. Oliver (J. August Richards) struggles to come to terms with Peter's (guest star Kevin Daniels) transgression, and Luly (Michele Weaver) gets some news about her adoptive family. Meanwhile, Theo (EmJay Anthony) makes some new friends, but soon finds they're a dubious influence. Becky Ann Baker also guest stars.