Same-sex unions are recorded in the history of a number of cultures, but marriage or similarly formalized same-sex unions were rare or nonexistent in other cultures.
Using this measure, siblings are actually 99.95% the same. The 50% refers more to the amount of DNA we get from mom and the amount we get from dad. So we are more similar to our relatives than we are to a mouse. Let's explore in a bit more detail what the 99.95% and the 50% numbers mean.
The short answer to your question is that both are half siblings. If you and someone else share a dad but not a mom, then you are half-siblings. And if the two of you share a mom but not a dad, same thing.What makes two children full-siblings or half-siblings all boils down to how much genetic information, or DNA, they share.Each of us gets half our DNA from our mom and half from our dad. Full siblings have the same mom and the same dad.So these siblings are getting all of their genetic information from the same two people. Half siblings only share DNA from one parent. The genetic information from the other parent is different.ull siblings have the same mom and the same dad. So these siblings are getting all of their genetic information from the same two people. Half siblings only share DNA from one parent. The genetic information from the other parent is different.