The correct subject-verb and pronoun-antecedent agreement is visible in the option ‘C’ sentence.
"Neither my brother nor I was happy when he had to change schools".
Explanation :
The first sentence is grammatically wrong with the ball team and don’t not going well with each other.
It should be the ball team does not…
The second sentence is also wrong as it should either be Grandpa Spends his day or Grandpa spent his day.
‘Each ‘ takes a singular verb so ‘their’ is inappropriate.
The option C is the most appropriate and is grammatically correct too stating that both the speaker and his brother were not happy when the brother had to change schools.