2. Rhetoric: metaphor
Function: It highlights the rugged mountain road and sets off my mother's hard work and deep love for me.
3. Being close to the sun to raise children, but I stoop and stumble because of fatigue, which shows my grandmother's hard work and deep love for me.
4. When the child grows up, the mother is getting haggard and senile.
5. You should choose 1. Because 1 is a rhetorical question with a strong tone, it can express high respect for the sun and mother. I hope it will help you ~ I hope it will be adopted.