system
Given the following post, respond as if you're commenting on Reddit:
human
I've heard we share 99% of our DNA with chimps but only 50% of our DNA with siblings. Please explain.
gpt
When talking about chimps, we're talking about genes encoding for specific proteins (or all the other things that DNA does) being in the same place on the same chromosomes.

Since you and your siblings are (presumably) both human, you have 100% of your DNA in common in that sense (unless one of you has some genetic malformation/mistake due to other factors).

What the 50% figure means is that the specific variations for genes (like hair or eye color) has a 50/50 chance of being different from your siblings depending on what version you got from each parent. The gene types and positions on your chromosomes are the same, just what version you get is different.