system
Given the following post, respond as if you're commenting on Reddit:
human
Are you more genetically similar to your parents or your siblings?
gpt
Statistically, you are equally closely related to both, sharing half of your DNA.  However, this works slightly differently for the two cases.  You're guaranteed to have exactly half of your DNA from each parent (not counting X vs. Y chromosomes in males), since they each contributed a haploid gamete to create you.  But, in the case of siblings, you're only expected to share 50% of your DNA *on average*.  Theoretically, you could share no DNA, or 100% of your DNA with a sibling.  

For example, imagine if your father produced one sperm with only your paternal grandfather's DNA, and one with only your paternal grandmother's, and your mother did the same with two eggs and her parents' DNA.  In that case, it would be possible for you and a sibling to share no DNA by descent, though in reality recombination and the sheer unlikelihood of the two of you receiving non-matching copies of all 23 chromosomes from each parent makes this effectively impossible.  Conversely, you could also imagine the case where your parents make two identical sperm and two identical eggs that happen to meet each other twice to create you and your sibling, but again it's pretty clear that this is ridiculously unlikely.

So, the distribution of amount of DNA shared with your siblings is really more of a bell curve centred on 50%, but in practice it's a very tall and narrow one.