Final answer:
Marji's parents encounter the fear of carrying sensitive materials and the potential destruction of their home due to political unrest in their country, as they return from their trip to Istanbul.
Step-by-step explanation:
The problem that Marji's parents face as they return from their trip to Istanbul stems from the political and social upheaval in their home country. The narrative hints at worries of carrying banned or sensitive materials and the possibility that their house may have been tampered with or destroyed. Marji's Grandfather wandering the house, touching everything, signifies the emotional and psychological impact this fear has on the family.
The phrase 'Take nothing' suggests a sense of urgency and danger, possibly a situation where the family might need to flee their home or country without taking their belongings due to political unrest or persecution. This creates an environment of uncertainty and fear for Marji's family, as they navigate through a reality where they might not know where they are going or if they will ever be able to return.