Panel 1: We start the arc off by Liz asking it it's "that" time already so that Elly can remind us that it's July so her parents are ready to move into the condo they bought.
Panel 2: Her argument about the pump organ their dad secretly always hated is going to pick her up and they'll be in Vancouver at 3.
Panel 3: When Liz wants to come with because the 'burb she lives in is Deadswille in the summer, Elly tells her that plowing through forty years of memories is hard fricking work.
Panel 4: As by way of example, lugging the canning jars Marian won't give away or toss will eat up most of their time.
Summary: An unwritten law of Mom Martyrdom mandates false practicalities such as 'saving' things that never end up getting used. This is why Marian won't get rid of crap that brings her no joy. It's why Elly saves Christmas wrap and turns her house into a fire hazard.