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South node Ketu in the 3rd house makes a person isolated with siblings, local community while making the communication process of the 3rd house a bit eccentric. These people have a hard time communicating with others in sales, media and marketing. When they explain something, it's quite difficult to understand the subject. The only time Ketu does well in the 3rd house is when it becomes a higher spiritual sage or an author that expresses idea in a written form since 3rd house deals with working with hands that includes writing. Ketu in the 3rd house brings about a healing power to the native, but their need for isolation and separate themselves with the material world brings about chaos in the communication and relation with friends, siblings and neighbors. But from the 3rd house Ketu aspects the 7th, 9th and 11th house. The spouse of the native would be quite spiritual and eccentric, there could be long isolation periods between the couple which may eventually result into separation. The aspect on the 9th house makes them isolate themselves from their own beliefs and create new faith and belief system just like Adolf Hitler did with Nazi party. He wanted to become the lord of his own making since Rahu is in the 9th house, as Rahu the north norde is always 7 places away from the south node. Then, Ketu aspect on the 11th house brings about isolation and separation from older sibling, network circle and carelessness towards gains. These people feel they are is a huge communication gab between them an their social circle, this is why they can not work into small or large group settings unless they are the creator of that group.
Ketu is about separation from the materiel world, in any house, ketu would extract the spiritual juice vs the materiel juice of that house.