If they were same-sex twins, they would have many similarities. Is a sperm and an egg, after the first division, independent division into adults.
As for their personalities, according to Feng Shui, the East Palace belongs to the eldest son. Children are advised to live in the bedroom on the east side of the house. If not, the bed should be placed on the east side of the room. My daughter tried to live in the west room.
In addition, in daily life, maybe my sister is too good, my son is unconsciously influenced, and then imitates it, making him look very feminine. Some families have no daughters, and their mothers are excellent or strong, and they will. It is suggested to encourage and affirm the son more, let him take the lead in making decisions, and establish the position of the eldest son in starting a family. For example, going out to play, eating and traveling. . . All the plans. Home layout, guest reception. . .
If there are conditions, you can choose to let him live on campus, separate from his sister, and be with his male classmates, which will gradually influence him.