Relations can be seen as a philosophical sparring partner.
And this will be to use the communicative reason.
The relationship is namely a medium of self-exposure, because the relationship is to be. It is the actual life.
Without relationships we don´t live.
In order to be able to understand yourself you must therefore understand the relationship.
You must become aware of how you react to the challenges of life, and for instance write it down in the philosophical diary.