Your answer is either B or C.
Juan es el segundo nieto. It is conjugated correctly.
Answer:
don't worry you got them both right :)
I don't understands neither, first you say that you are not okay and then you say that you are excited.
1-fueron (ir)
2-estuvo(estar)
3-fuimos(ir)
4-son(ser)
5-somos(ser)
6-irá(ir)
7-van(ir)
8-?
9-fui(ir)
10-fue(ir)
I think this is right