Judging by the picture, whenever his mom calls he's seized with panic and is shown desperately trying to remember whether he forgot her birthday (again).

When his dad calls, he puts on his Serious Man-Face and gets ready to field Serious Questions about his future and whether he's started saving up for a house yet.

From the submitter:

"Uh. I mean. Yeah! How dare you forget! Buy me a new car?"

Dad never jokes about his alcohol.

You know what? Let's make this a thing. Instead of all the navel-gazing GPOY (Gratuitous Pictures Of Yourself) I see everywhere, let's spread the love and start sharing GPOO (Gratuitous Pictures Of Others) to each other. Much less self-centered and a better way to show our friends we care. The only thing to fix is the acronym GPOO. The less it sounds like poop, the better.