This largely emotional house is the house of Home, it also represents family, and anything that makes us feel at home, it represents our deepest parts that help us find connection with another human being, not just like the 11th house in a social sense, but more unconditionally, like one between parents and children, and between siblings. The 4th house is ruled by the Cancer zodiac sign and the moon. This house is so powerful that the traits from this house are hereditary. Everything about this house is about family and nurturing the closeness that keeps families together. However, the downside to this house is the fact that it can make one averse to change, holding strongly to the ways that one has known all their lives.
The sun in this house makes the individual appreciate the good times and let go of the bad times as ingredients of their present state. The moon makes the individual more appreciative of their mother or a maternal figure and encourages them to seek their continued support. Mercury in the fourth house helps with the communication aspect of keeping the family together, the individual would want to talk things through.