I think we have to be mindful of cultural differences when looking at this story.
Asian culture in regard to marriage is very different to ours, and although perfectly normal and acceptable to them, it seems restrictive and wrong to our Western sensibilities.
It is quite possible that the couple's son has an arranged marriage, as is common in India and Pakistan, and if so, they are quite correct is stating that they 'got him married' because they will have selected his bride for him.
There is also a different expectation in terms of grandchildren in other cultures.
As Westerners, we may hope that our children will give us the gift of grandchildren, but it would be foolish parents indeed who tried to seriously influence their children's decision, which we see as theirs and theirs alone.
Admittedly, this couple are taking their desire for grandchildren to a level that we would consider unacceptably extreme, but that is not to say that their desire to influence their family will not have the desired effect.
The desire to please parents by Asian families is seen as far more important than in Western culture, and it may be that the children will consider accepting and complying with their parents' and parents-in-law's wishes.
Watch this space.