I do believe it is. In the grumpy photo, while grump is further from the camera, it doesn’t look too much further away than the owl with its back to us, yet it still looks to be fairly smaller, as male owls typically are.

Grump also has a white chin but almost no white around the eyes, while Proud has a less white chin but very obvious eyebrow lines. So my guess is that is mamma and pappa.

Stifle yourself already!