Your relationship with your parents is your partnership template. When examining relationship patterns, parents are often the first subject that comes up. How you experience Mom and Dad is indicated in the natal chart. Your Sun (and Saturn) describe your father, and the condition of your Moon describes your mother. Note the phrase “How you experience…” While the natal chart reveals facts about your childhood (the love or abuse you received will show up very clearly) it is also a subjective filter.
Your Moon describes baseline needs and emotional expression, but its natal condition also describes your perception of the care and comfort received from your mother. Sign placement alone will have something to say about this, although it’s just the tip of the iceberg. Your Capricorn Moon can describe a cool, controlling mother. When siblings have Moons in different signs, it indicates their different experiences of mother. For example, Capricorn Moon has a Pisces Moon sibling. Mom may have failed to set boundaries with Pisces; the rules she insisted on for her Capricorn child somehow dissolved with Pisces Moon.
But Moon sign is only one indicator, and it paints a very simplistic picture. For a full description, you need to look at house placement and aspects to other planets. A 10th House Moon in Pisces, conjunct Neptune, suggest that you found Mom to be domineering. This is due to the Moon’s placement at the top of your chart. But she was not domineering in a typical way. The conjunction to Neptune in Pisces suggests she may have been weakened due to illness. Maybe she was an alcoholic, or suffered from depression. She may or may not have been codependent, but you felt that she needed your care. Her issues dominate your life. Any corresponding habits you have — involving surrender, helplessness, depression or addiction — will dominate your relationships. Looking at the positive side of this, perhaps you learned a tremendous amount of compassion and empathy from your mother, and these qualities rule your life.
A trine between your Moon and Pluto suggests a powerful mother. The harmony of the trine can indicate a supportive relationship with her. Let’s say you have a 2nd House Taurus Moon, trine 6th House Pluto in Virgo. Perhaps she enabled your self-esteem and security (2nd House) through her determined and insightful approach to your medical issues. Moon/Pluto in any aspect is transformative — there may have been a crisis in your childhood. Maybe you were quite ill and almost died, but she stayed by your side in the hospital, and then gently but relentlessly nursed you back to health once you came home. The resulting impact on your future relationships can be seen, as you approach them with a stability (Taurus) born from having survived the worst.