Its not cultural thing, its religion who has also a duty incumbent on the parents to get their daughters married off when they reach adulthood .
Only daughters have this right over their parents. Sons have been commanded to acquire material means to maintain the living. They should not become the burden on the shoulders of their responsibilities.
The parents spend money at the marriage of their daughters, but it does not mean that they should spend beyond their economic capacity nor mean that they should run under the debts for meeting the expenses of their daughter’s marriage.