Sorry, this a DNMC for me, points subtracted for that. Photo wise, EXCELLENT lighting on the face. Since the background is rather boring, I would suggest a much tighter crop, maybe go for portrait orientation. I assume the negative space appealed to you, but it doesn't work for me.
As for meeting the challenge... yes, sibling love can be very powerful, but I'm not entirely sure how this image portrays sibling love. Perhaps the boy is thinking of a sibling who is far off. As for technically... IMO, the border doesn't work very well here. But the lighting is beautiful! Overall it's a sweet shot that potrays meaning. :)
it's a nice shot...if it's not for this challenge. The title claims sibling love, where's the other sibling? A hugging shot would have been more fitting.
How do I know that this person has a sibling other than the title. Perhaps you could have them looking at the sibling or an object that represents the sibling. The photo doesn't seem to support the title.