I'll wait for the Instagram in that case, sir 
These 2 haven't been introduced in my comic yet.

Although technically they already appeared, only they looked very different.
They are not siblings.
These characters are from a short comic I drew last year to practice digital coloring. It started as a series of images, and I still have to finish a few connecting images and format it, before I upload it on Tapas. The characters are from a novel a friend and I have been writing at a super slow pace over the past... decade (oh gosh it has been that long D:)
They are adults in the novel, but I drew them as kids for these images.