Same-sex marriage, also known as gay marriage, is marriage between people of the same sex, either as a secular civil ceremony or in a religious setting. 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.
DNA between siblings are similar if you share the same biological parents. The genetic information you gain comes from both of your parents, and are a result of fertilization of 2 haploid cells fusing to form a zygote that has a diploid number of chromosomes.
Sibling DNA Testing. Sibling Testing is a DNA test process that is performed to determine if two people share one or both parents. For example to determine if they are full or half siblings. This is an indirect method to prove family relationships when the alleged father is not able to perform a paternity test.