Wind and water two sons: neutron or boy?

1, there are only two boys, the eldest is the eldest son and the second is the second.

2. stillborn people are not in the ranking.

3, two brothers and sisters, younger sister regardless of eldest daughter, middle daughter, younger daughter.

Each generation is ranked by Bangladesh, China and Kyrgyzstan, which is also called housing distribution. 1, 4, 7, 10, 13 are Meng rooms, and 2, 5, 8, 1 1 4 are secondary rooms.