Pluto in 4th House synastry forms relationships between individuals on the basis of mutual interests in everyday life, housebuilding, and family. The ‘Plutonian’ personality constantly attempts to positively and constructively change the living conditions of the Fourth House person and often succeeds due to the power the planet gives.
The negative impact of a Pluto in the Fourth House synastry relationship is that the swings from the constructive to the destructive are easy and many. But if the aspect is positive, the partners are eager to approach environmental issues as they love nature and enjoy a healthy lifestyle.
The areas of joint life activity may include anything which relates, indirectly or directly, to the issues of everyday life and housebuilding (harvesting, interior design, etc.). The partners enjoy traveling and are socially active and stable throughout their relationship.
from F. Sakoyan, L. Ecker
Pluto in 4th House Synastry Explained
Pluto in 4th House synastry carries a certain hint of threat and necessary sacrifice. You will most likely feel it more than your partners, though, in reality, this aspect is more dangerous for them than for you.
In theory, your Pluto in Fourth House synastry partner will cleanse your life positions and basic attitudes, both conscious and subconscious ones. Once their Pluto is activated, this will happen not only by their will but also seemingly by itself.
The circumstances around your relationship will develop so that any inconsistency, confusion, and low level of your fundamental life attitudes are exposed, manifest directly in the material of your everyday life. Yet this does not mean that you will necessarily understand what is happening, and who is to blame. The inescapable answer to the latter question is “you”, but you will do everything you can to put the blame on your partner.
Another problem is that astrological aspects of the highest planets (Uranus, Neptune, and Pluto) are often manifested in such small details, such minute shades of background and atmosphere, that they pass completely unnoticed.
It will be remarkably difficult for you to relax, feel comfortable, and be at ease in your Pluto in the 4th House synastry partner’s presence. Remember that this person’s function in your life is that of a test, and that by challenging you with small losses (they are small, no matter what your inner pettiness is telling you), this partner prepares you for the ultimate encounter with those family issues that you would be the least likely to confront at your own volition.
from A. Podvodny