IntroductionThe sequence of kanyA dAnam, pAni grahaNam and sapta-padi convey a specific set of meanings. They have to be seen together as a series of steps and not stand alone procedures. These are common across different grhya sutras that different communities follow.
What is kanyA dAnam..?Human beings are supposed to have evolved from primates like chimpanzees. It is estimated that 70% of human genome could be similar to that Chimps (15% to that of gorillas), stating how closely we were to Chimpanzees in evolutionary tree (2). Chimpanzees have a patrilinear society in which males tend to stay together in groups, while females move out into other groups(1). This helps avoid in-breeding and enables better natural selection processes.
So humans have followed and developed this patrilinear structure probably from their chimpanzee times to a patriarchal structure over a period. This patriarchal structure makes male look superior as males venture out and females look inferior as they were totally domiciled.
The practice of female going out of a family for breeding thus stems from the time of chimpanzees. kanyA dAnam is a procedure of patri-linear tradition, wherein females move out to newer families to avoid in-breeding. In humans this is ensured by females changing their 'gotra' and becoming part of the new family.
dAnam and kanyA dAnamAll our sAstras and scriptures are clear that we own nothing and can transfer nothing to others. What we own actually is 'attachment' to beings or objects and nothing else. We cannot own any being or object. We own only our attachment to them.
kanyA dAnam - Desiring brahma-loka
The bride's father tells the groom, that he is giving the Lakhsmi (the kanya bedecked with golden ornaments) to Vishnu desiring brahmaloka.
Since people don't understand brahmaloka, they translate it is heaven. Brahmaloka is not heaven. No scriptures say, people die and go to brahmaloka. So what is brahamaloka..?
Brahmaloka is the world without extraneous aid or a world that is completely independent, on its own (ahaitukam) that sustains other worlds (Srimad Bhagavatam chapter 9.5.22). It is simply the world of Universe's expanded space (brahma) that holds all the matter and beings of the Universe.
Like the Universe's expanding space that holds all the matter and beings which evolve on their own, when bride (vishnu) and groom (Lakshmi) unites, they become the fountainhead of a new generation of families that expand and evolve on their own.
This is the bramaloka desire of the bride's father and not 'heaven' as it is interpreted.
The next sloka which is also common across several grhya sutras explains it further
viswambhara sarvabhootha saakshinya sarvadev
imaam kanyaam pra dasyami pithroonaam taaranaayavy
The Universe's space (visva ambara), all the matter and biological forms (sarva bhuta) witness (saksinya) all the natural divinities/forces (sarva deva) this (imam) kanya's (kanyam) certainly I give (pra dAsyami) the pitrs who have crossed over (pitrnAm tAaranyavi)
All the divinities (sarva deva) are observers/witness (sAksinya) to bhutas (matter and biological beings) (evolving) in the Universe's expanded space (visva ambara), which is the brahma-loka. The pitrs who have crossed over are so for giving this kanyA.
The devas/natural forces/divinities help the bhutas (matter and biological beings) sustain/evolve on the Universe's space, by being the 'witnesses' or 'observers' of the evolution of bhutAs. Observers drive the evolution (3). In the same way we invoke our pitrs (ancestors) to be the observers for the evolution of this couple.
Simply put, the bride's father says, Vishnu, this is your Lakshmi. Become independent fountain-head of a new generation that evolve on their own. I desire that brahma-loka from your joining.