Sun - Rahu conjunction within a 7 degree orb or so is not good for married life. Leads to divorce like situations. If afflicted by Mars then it can lead to disputes (legal & otherwise). This impacts when in 7th house the most or in Ascendant. If sun - rahu conjunction is in the 4th then the native will be emotionally cold and have a dual personality in showing his emotions with the partner. He would be normal in behaviour when in society but cold when alone. Test this.