Final answer:
The text does not directly answer how Marji's grandmother responds to questions about the past, but given the context of other characters' interactions, there is generally a hesitance or complexity in dealing with the past.
Step-by-step explanation:
How Marji's grandmother responds to questions about the past is not directly answered in the text provided. However, the materials give us insights into characters' reactions to discusses about the past or personal stories in various contexts. For example, characters like Sylvia's grandmother and Maria Macapa respond to queries about their past with silence or avoidance, indicating a reluctance to engage with the subject. Sylvia's grandmother is too busy to entertain questions, while Maria shuts her eyes and lifts her chin, suggesting she has much to say but chooses not to. In other instances, characters like Marjorie and Bernice deal with confrontation regarding past events with defensiveness or embarrassment, respectively. Overall, these reactions depict a general hesitance or complexity in dealing with the past, a theme that could presumably extend to Marji's grandmother as well. The stories told by grandmothers can be a source of important values, as indicated by the adolescent girl's quote.