Imagine twelve year old Harry not even knowing how awful his childhood with Dursleys had been until he gets to the Burrow.
Imagine him seeing Percy asleep with a book on his lap, and being baffled that a kid might feel comfortable enough in his own home to be so vulnerable in the living room.
Imagine Molly coming up to the attic to say goodnight to Ron and Harry, and Harry glancing at Ron when he hears her footsteps, trying to figure out what they had done wrong that day.
Imagine him asking George who does all the house chores, and thinking it’s a joke when George answers, “we all do.”
Imagine Ginny pestering Arthur with questions over the Daily Prophet, and Harry trying to shoot her warning looks to stop it! but then Mr. Weasley looks up and patiently answers every single one.
Imagine Bill popping in for a visit one evening and Harry being floored when Bill stops to chat with him.
Imagine Fred chasing after Harry in the yard, playfighting, but Harry actually begins to run for real fear of being hurt.
Imagine Molly burning something on the stove my accident and tossing it, imagine Harry mentioning to Ron, offhandedly, “she could’ve given that one to me, it’s what I eat at home when I mess up dinner” and not knowing why Ron is horrified.
Imagine Harry seeing what a normal, functioning family looks like, and realizing the absence of love in his own life.