The main themes in the Nangi family story could include love and support among family members. In any family, the relationships between parents, children, and siblings are crucial, and these relationships are likely to be central to the story. Also, adaptation could be a theme. If the family has moved to different places or experienced changes in their circumstances, how they adapt would be an important part of the story.
One possible main theme could be family unity. Families often face various challenges, and sticking together is important. Another theme might be heritage, as the family may have a rich cultural background that is part of the story.