If you are a well-educated young man, I will continue to speak, otherwise, the reference value is not high:
A person standing on a stone refers to your subconscious understanding of your current self-emotion: depression, loneliness, and the possibility of being wronged. You can feel it yourself.
Turbid water is your environmental background. In real life, you feel the pressure, rejection and gloomy mood brought by life or work, which makes you feel confused, dangerous and confused. The flood flooded everything and faded all the surrounding scenery, which is the sublimation embodiment of suppressing loneliness; If you go on, the flood will drown you, and there will be such consciousness and worry in your subconscious, worrying that you will be crushed by pressure.
However, your 70-year-old father's distress temporarily freed you from your worries, so "you didn't die in the river." Its significance lies in that some responsibilities or obligations (probably a sense of responsibility for the elderly family) prevent you from falling down at will, suggesting that you must persist in facing pressure and problems. Of course, this kind of psychological suggestion will make the situation more difficult.
Father washes his body with clean water because you think that the comfort from family (or other things) has brought you some relaxation and reduced the pressure, but at the same time, you also know clearly that this is a temporary solution, but you still need to face it yourself, and the tangled problems can only be solved by yourself. I wanted to get rid of this, so I changed into dry clothes, but the pus was still there.