Rahu in 4th House. 

So, lets see what Rahu can do in 4th house without any conjunction or aspect from any other planet. 1st lets see what these 2 things represent - 

Rahu represents illusion, foreign lands, foreign things (foreign as in unknown things. So, for someone living in Punjab, culture and rituals of Kerala is also unknown and hence Foreign), Drugs, Medicines, any type of intoxication, fame, wealth, success, obsession, past-life left-over karma, movies, television, online world, cheating, imagined fears, unusual things, unique things, creativity, rule breaker. Rahu also blows things out of proportions. 

4th house represents your home, home environment, homeland, mother, nourishment, childhood friends, peace of mind, conveniences etc. 

Aspect-wise, in Vedic Astrology, Rahu has 5th and 9th house aspect. He is unable to impact 7th house from its place as Ketu is sitting there, which is the other axis of Rahu and represents all those things which are non-Rahu.

So, when Rahu comes in 4th house of home, land etc., these people become highly obsessive about land, home and real estate. They easily go into real estate business. To get property these people can even do fraudulent activities.  It may be that these people have a home at foreign lands or they are raised by foster parents. It may also be that they are sent at a foreign place early in their childhood. Their early education is impacted by malefic Rahu. They can find peace of mind in foreign lands. 

From 4th House, Rahu aspects the 8th house & 12th house with its 5th & 9th aspect. This shows that they will gain peace of mind through higher education of occult, mystical and spiritual subjects. 

Thanks,

Swami Premanand Bharti