(Subtitles for those who want a more accurate depiction of this)
Gallus: Your Majesty, she's here. Princess Twilight Sparkle: Send her in, Gallus.
(Gallus walks in the halway while looking back with a big smile on his face.)
Familiar Voice: Hi, boy.
(Gallus turns his head to see where that voice is coming from and gasps in joy.)
Gallus: Gramps!
(Gallus runs towards Grandpa Gruff and nuzzles into him. Grandpa Gruff returns the embrace.)
Grandpa Gruff: So, Captain of the Royal Guard, huh? How's it like?
Gallus: Oh, trust me, it's great! But it's also exausting. You won't believe how-
(Grandpa Gruff hugs Gallus.)
Grandpa Gruff: I'm so proud of you, Gallus...
(I don't think I need to say the rest. The scene speaks for itself. :'D)