Marriage bonds

The traditions of marriage seem to vary from culture to culture. I believe marriage should be the same in all cultures because it allows for a steady family system. However, I do understand cultures that believe it to be not beneficial. In a culture where raising children to carry out the family blood line, marriage is essential. It would present major challenges for children to not know where their roots are. An example of this is found with the British monarchy system. Monarchs are chosen according to their bloodline. Without married parents, knowing where his blood line is rooted is essential.