Don't deny it.
They creep you out, too, don't they?
What with the matching outfits (especially the one with bell-bottoms*) and the (rose-adorned) guitar, I also get the impression that they're like a smaller-scale, more folksy, soulful version of the Brady Bunch Group (whatever they called themselves).
*Ah yes, the crocheted bell-bottoms. (You didn't think those escaped my ever-scrutinizing eye, did you? Oh ye of little faith!) Is it just me, or doesn't it look like the only reason they're staying up is that they're being held up? Might explain why the girl in the skirt is holding the guitar. The bell-bottomed girl has to content herself with vocals, leaving both hands free to avoid a major "wardrobe malfunction".