Sun in 4th House synastry epitomizes dramatic family relationships (for example, those between the parent and the child), or the relationship of people living under the same roof without necessarily being relatives.
Synastric relationships governed by the Sun in Fourth House are of an internal subconscious nature. If they develop in a positive direction, then the following chain of cause-and-effect manifests:
(1) stimulation – (2) increase in self-expression – (3) response to stimulation
This chain is inherent not only to the Sun but to all 4th House synastry aspects.
from F. Sakoyan, L. Ecker
Sun in 4th House Synastry Explained
The Sun in 4th House synastry is a promising aspect, as long as the partners can figure out its meaning.
Your partner’s will is very significant to you, but he or she may not notice it since your reactions to their initiatives are most often purely internal, with the exception of any direct answers you provide in response to questions. Thus, your partner’s will becomes a covert force that supports or afflicts your life. Naturally, you don’t remain indifferent to this.
The volitional incentives of the Sun in 4th House synastry partners are examined by you (at least subconsciously) from the standpoint of your life ethics. Conversely the partner’s life ethics are examined on the material of their initiatives toward you.
Example of the Sun in Fourth House Synastry
Consider a situation when the wife’s Sun is in the Fourth House of her husband who has the following life principle: “Listen to women and do the opposite of what they say.”
Any initiative of his wife will be regarded strictly through this principle regardless of its true value. Initiatives of other women (whose Suns fall into the husband’s other Houses), will not evoke this principle so definitely.
If at some point the principle fails to work (the husband does not follow his wife’s advice and makes a mistake; or does follow her lead and everything works out in the best way), he will be seriously afflicted because restructuring life’s positions is a very difficult, unpleasant and energy-intensive affair.
The good news is that, in a harmonious version of the Sun in 4th House synastry, the wife will fully trust her husband while her support will give him a new source of strength and inspiration.
from A. Podvodny