The correct answer to this open question is the following.
You forgot to include the options for this question and the reference to the book. However, doing some research, we can say the following.
The conclusion that can be drawn from Grandpa's dialogue in this excerpt
is that "Grandpa’s culture has strict rules about gender roles."
That excerpt belongs to the book "Medicine Bag," written by American author Virginia Driven Hawk Sneve. She specializes in telling children stories with important moral at the end.
In the story of "Medicine Bag," the author tries to share the importance of elderly traditions, experience, and customs, and the need for the young people to learn from that amount of knowledge.