"Oh your father is so cool!"
Teddy, James, Albus, and Lily hearing this over time and just thinking of their father at home cause:
-Harry once tried to convince them that if he grew a beard he would be more modern (which resulted in his normal stubble but with god awful hair patches)
-Harry had a worn out shirt he would wear all the time and whenever it got into the wash he would do laundry, chore chart be damned
-Harry getting them the merchandise with his face and trying to convince them that he is ALWAYS WATCHING
-Harry trying to set up a date with Ginny but forgetting to call a babysitter so he brings the kids with them (and date night at a fancy restaurant turns into date night at the park with over-fried food and lots of mud in the house)
-Harry trying to convince his kids to make a secret hand shake with them
-Harry and Uncle Ron falling asleep in the living room 5 minutes into the television program
-Harry bringing up he died a few times when they complain about chores.
“When I was your age a murderer had escaped from Azkaban and trying to finish me off cause I did Voldemort in.”
“Arn’t I named after that murderer?”
-Harry wearing Ginny’s Quiditch shirt (despite it being to small)
“I love the support dear, I do, but can you not stretch my shirt?”
“…it won’t come off.”
-Harry trying to do yoga
-Harry coming down every morning with a big grin on his face because he loves his kids so much and would obnoxious kiss them all on the cheeks
-Harry making faces in the mirror as he brushes his teeth (convincing the closest child it’s more effective)
(Celebrating when Albus starts doing it with him)
-Harry once showed Lily how to shave by shaving his own leg and walking around with one leg shaved despite complaints by older children and wife.
“If dying has taught me anything it’s to be yourself.”
“Oh my god Dad just stop wearing shorts.”
-Harry using him ‘dying’ as a reason to do anything really
Feel free to add more, but I’m 10000% convinced that Harry Potter is not the cool dad