Mercury rules 3rd and 6th house is in 4th house in Cancer

Mercury in the 4th house of Cancer sign indicates that you are likely to be a quick-witted and intelligent person who is deeply interested in learning about your family roots and heritage. You have a strong emotional bond with your family and may be very protective of them.

This placement indicates that you may have a talent for writing or speaking about topics related to your family, heritage, and emotions. You may have good communication skills and may be able to express your thoughts and feelings effectively.

However, Mercury in Cancer can also make you quite sensitive and emotional, which can sometimes cloud your judgment. You may also be prone to overthinking and worrying about your family and home life, which can cause stress and anxiety.

If you can balance your emotions with your rational mind, you can become a skilled and intuitive astrologer who has deep insight into the human psyche. This placement can also help you develop a strong intuition and understanding of people's emotions and motivations.