Genetically speaking, am I more closely related to my individual parents, or one of my siblings, excluding identical twins?
In: Biology
On average it is equal.
You are 50% genetically similar to each of your parents.
You are (some random percentage that is usually close to 50%, and averages out to 50%) genetically similar to siblings.
Depending on that specific number for a pair of siblings they can either be closer to each other than their parents, or vice versa.
If you are talking theoretical, you could even have a genetic twin sibling who wasn’t a twin, or a sibling you shared no DNA with. But those are two extreme ends of a spectrum that the chances of happening are astonishingly small.
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