Betrothal is condition by human to responsibility for their need. In the first period, betrothal was established in people and social. When the betrothal was more acceptable betrothal was extended to various social groups are middle class and low class. Finally, betrothal was popular and practical consecutive. Later, betrothal became to tradition. In different social there have different procedure.
Betrothal is recognition between both of families and deemed to be announced to the society to know. At the same time, men and women have to appropriate in public. When consider to Thai social that has tradition, if you want to have family your parents have to know and permit. So, betrothal was acceptable and became to a part of Law