What means if my Venus is in conjunction with my Sun, in Gemini ?

The twelve signs symolize the different approaches one can have to one's existance. The sun is related to our consciousness, while venus relates to our spiritual relationship with the earth and as such love and relationships. So in consiousness and relationships you work in a gemini way which is to say that you have a strong air (mind and thought) element which is mostly recepetive and therefore prone to change and reflection upon yourself and your circumstances.
A conjunction can lead to a strengthening, but it is also possible one will dominate the other. A strengthening conjunction will tune your awareness to relationships and harmony, while a weakening conjunction can lead to over analyzing instead of feeling and experiencing relationships and harmony.

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Greetings!

Well, Venus in Gemini people will try to win over the object of their affection with witty conversation, displaying just how much they "know", and demonstrating their diverse interests. These lovers are playful鈥攕ome might even call them a tease. They are hard to pin down, and they resist relationships that promise to become too "comfortable". Even those with their Sun in Taurus or Cancer, whose outward demeanor may suggest some reserve and caution, will want their relationships to be stimulating and full of conversation with Venus in Gemini.

Venus in Gemini men and women don't want to be tied or bogged down in their relationships. They appreciate lightheartedness in love. Although they are willing to talk (perhaps endlessly) about the relationship, you may get the feeling that they gloss over some of the deeper issues. In love, their tastes change often, and it can be hard to know what to expect from one day to the next (or, sometimes, from one hour to the next!).

Pleasing Venus in Gemini involves supporting their need for fun and variety, showing interest in their brainpower and knowledge, and giving them space for friends and activities outside of the relationship. Let them know just how much fun you have with them. Try not to get overly miffed by Venus in Gemini's changeable, fickle ways. Remember that time spent with your lover will be exciting and invigorate.

Blessings

It depends where the other planets in your chart are positioned in relation to that conjunction of venus and sun. You will have a lot of love but for that to be good or bad experience, you need to have the position of the other planets in good aspect to that sun and venus.

Depends upon the aspects to such. Generally, issues with your father (or step-fathers) siblings, travel, transportation, communication, legal documents, neighbors. But specifically points to a female in your life, whether for good or ill, in general. Or it may point to a younger brtother, as Gemini always means younger.