It can take many years for ancestors’ energy to become fully integrated with ours. However, when we are in a vulnerable state, when we are ill, have suffered from a physical or mental trauma, long-term stress, or spend too much physical or mental energy, it is easier for that energy to tune to our weakened state. (prolonged periods of meditation and certain spiritual practices also facilitate it;
Forum:
"Cults," Sects, and "New Religious Movements"