Final answer:
The exact reason Mattsson needed to wait six months to marry his intended bride after her parents' approval in 'His Mother's Portrait' is not specified without additional context. However, based on examples from other literature, waiting periods before marriage often pertain to societal customs, personal preferences, or logistical arrangements.
Step-by-step explanation:
The question appears to reference a narrative that involves a waiting period prior to a marriage once the parents have agreed to it. In various literatures, characters may have to wait due to personal preferences, societal customs, or logistical reasons such as making arrangements or acquiring financial stability.
For example, in one narrative, Joe had to wait fourteen years to make his fortune in Australia before returning to marry his betrothed, Louisa, who waited patiently for his return. In another instance, Rebecca and John planned on getting married post-college, following traditional family practices and potentially awaiting the completion of their education. The waiting period can serve as a narrative device, exploring themes of patience, commitment, and the societal pressures that impact the characters' lives.
Without the specific context of 'His Mother's Portrait,' it's difficult to ascertain the exact reason for the six-month waiting period. However, historical and social contexts provided in similar narratives suggest that the delay could be due to personal choices, social customs, or logistical challenges related to preparing for a marriage.