Social groups in my city

[John]

There are two social groups, I named "Lovers of elder sister and younger brother" and "Old husband and young wife", in Hong Kong.

"Lovers of elder sister and younger brother"--usually the female lover is about 35 years old compare with the male 25.

"Old husband and young wife"--usually the husband is 65 years old, the wife 25. They got a son at the age of 5 now. The husband is a Hong Kong citizen who married a girl in mainland China five years ago. Now the girl and her son immigrated to Hong Kong to live with her husband. There are many cases like this. These create many family and social problems.

[Victor]

The two specific groups of dating pairs / couples do pose social problems but they are not representative of the normal relationships existed in Hong Kong!