The 12th house is the house of external restrictions, the house of solitude, closedness, immersion in oneself. A person with the Sun in the 12th house will show a secretive person, he has ideas, plans, interests, but he will not broadcast them publicly. Such a person may be immersed in themselves, but this does not mean that they are not active. They can be very active in their own space.
Such people do not like to express their opinion and intentions openly.
People with the Sun in the 12th house can work remotely, at home very well. They feel good in solitude, this is when insights, discoveries, the desire to create come to them.
Also, such people can work in closed institutions - monasteries, prisons or secret organizations. It also indicates that a person may work abroad. Or an indication of emigration. Women with this position of the Sun may lack the desire for social fulfillment and the desire to be a housewife, but not necessarily.
Also with this position of the Sun, there is simply a need to be alone with oneself, this is how the person rests and recovers. They often love to travel alone, away from the hustle and bustle, to recharge.
As the image of the father, it is not a simple position. As a rule, there is a subconscious, deep connection with the father. But even if the father died early or he is far away, there is always a thread that binds him to the father. And just the idealization of the father, or again, an indication of the father's difficult profession.
For women, the husband may be from afar, or it may be difficult to build relationships with men.