The fourth Bhava in indian horoscope stands for Mother, Land, building, education, vehicles, relatives etc. Moon is also significator for Mother and Mars for land and buildings. So their connection with 4th house is always good.
Once again the 4th Bhava, its lord and the karakas, their placements, aspects and associations decide the effectiveness of the 4th house in a horoscope. Since this house signifies the land it also signifies the entire land based products including buried treasure etc. On the other hand if land happened to be apart of burial ground at some time then the information about the evil spirits which may be hanging there can also be found by the association of malefic with 4th house in a horoscope
The effect of different planets in 4th as per Indian astrology:
Sun- mental anxiety, enmity with relatives and bad effects to mother
Moon- bad for mother, but acquisition of land and vehicles provided moon is in a good house.
Mars – bad for mother but acquisition of property and vehicles will be there.
Mercury- Intelligent, clever in speech, good education and acquisition of property.
Jupiter – Good for mother, Good education, good home and good vehicles.
Venus – Good for mother, Wealth, property, acquisition of jewels, vehicles etc .If in his own house or the house of exaltation he causes Maalavya yoga which is one of the Pancha Maha purusha yogas in Vedic astrology.
Looking at the planets from this point of view the 4th house being a quadrant from the ascendant if the following planets placed in their own or exaltation houses cause Pancha Maha purusha yogas such as:
Mars gives Ruchaka yoga
Mercury gives Bhadra yoga
Jupiter gives Hamsa yoga
Venus gives Maalavya yoga
Saturn gives Sasa yoga.
Saturn – Saturn in 4th other than his good houses is not good. Will be interrupted or prolonged beyond reasonable age of completion. Bad for mother also.
Raahu- bad on the whole except when Raahu is exalted
Kaytu: good for education but Mother will suffer great anxiety on account of one child
Accurate horoscope predictions based on indian horoscope by ‘The Himalayan Ashram of Vedic Astrologers’ are available in the United States of America (US), Canada (CA), Australia (AU), New Zealand (NZ), South Africa (ZA), Japan (JP), Singapore (SG), Hong Kong (HK), Malaysia (MY), United Kingdom (England, UK), France (FR), Switzerland (CH) , Netherlands (NL), Norway (NO), Sweden (SE) and India (IN).