My in-laws family are all in Canada, Besides my parents-in-law, there are 10 adult children including spouses. The two eldest sisters are both single, and they are taking care of the parents. Many times, these two sisters talk to the third generation about that: when they grow old, they need their nieces to provide cares. I told them the other day that, including my son, the third generation consists of only 4, and there are 10 of them in the second generation excluding my wife and me. Guess the kind of care they could get from their nieces.