Okay so. Ser has many forms of putting it
Yo-Soy
Tu-Eres
El Ella Ud.-Es
Nosotros-Somos
Vosotros- Sois
Ellos Ellas Uds.-Son
I don't know if i answered right.
Answer:
The GRANDDAUGHTER goes to visit the GRANDPARENTS. Im not sure wich one is underlined sry so I translated everything. I hope ot helps amigo ;)