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.
Now, if the two siblings were of the same sex then, yes, two brothers will (within probability factoring in mutations) inherit the same paternal DNA (Y DNA)âwhich is only one of the 23 you inherit, the other 22 will have more variations.