As for Leo's ascendant, Sun is the ascendant lord. The first thing we need to look into is the position of Sun, in which house, sign, and aspects. Then, only we look into Rahu and Ketu. If Rahu is in 4th, it is in Scorpio sign and Ketu will automatically be in 2nd house, Taurus sign.
I would not share much about how negative things would be in a native’s life, as many astrologers already commented on how bad it is when Rahu and Ketu are placed in Kendra's (1,4,7,10) houses.
RAHU in 4TH
Material possessions: When we talk about Rahu, basically fraudulent activity comes into mind. That might happen to native, that he/she might use whatever method, even though it is illegal when obtaining items related to 4th house matters, such as properties, vehicles, any fixed assets. BUT, don’t forget that Scorpio is the lord of the 4th house. Mars would be the soldier who protects the native from any fraudulent activity. In this case, native would not easily get cheated by Rahu, who always obsess about fixed assets. Of course, that would only happen if Mars is strong in native’s birth chart or exalted in the Navamsa chart. Those people you saw who use illegal methods to gain fixed assets, I guess they might have bad placement for Mars.
Sritulasi is an astrologer from India having 40 years of experience.