Planets in houses · Kendra
Ketu in the 4th house
South node · Sukha Bhava
Ketu is the karaka (significator) of detachment, intuition, spirituality and past karma. The 4th house, called Sukha Bhava, shows home, mother and happiness. When Ketu sits here, these matters take on its colour.
In the 4th house a malefic can disturb peace at home or with property, and asks one to build inner calm.
The 4th house is a kendra (angular house), a pillar of the chart, so a graha here shows its results openly and strongly.
Ketu is a shadow graha and gives the results of the sign lord and conjunct grahas; it is considered strong in Vrishchika.
Results are weaker if Ketu is debilitated in Vrishabha, combust, or afflicted by malefics.
In transit (gochar)
When Ketu transits the 4th house counted from your Moon sign, the period traditionally needs more care.
A single placement is never read alone: sign, aspects, conjunctions, dasha and the whole chart change the outcome.