This is one of the more specific combinations in a chart: a house that governs subconscious, run with Cancer's instincts.
The 12th House represents subconscious, solitude and spirituality in the birth chart. It is one of the twelve sectors of the sky at your birth, each governing a different area of life.
Its recurring themes: The core themes of the 12th House are subconscious, solitude and spirituality. Any planet here brings its energy into this exact area of your daily experience.
Cancer is a water sign ruled by Moon, known for its bold, unmistakable energy. People born under Cancer are driven by cardinal momentum — they start things with enthusiasm and live with visible purpose.
In the twelfth house, those instincts get applied to subconscious rather than to personality in general.
Keep reading: the 12th house · Cancer · Cancer traits · all twelve houses · astrology guides · zodiac signs
Yes — every house cusp falls in a sign. Which sign depends on your exact birth time and location.
No. The sign on the cusp describes the style; planets inside the house describe what is actually happening there. Both matter.
It is a background influence. You notice it most when subconscious becomes the main thing you are dealing with.