The front curtain of the scenery was opene

Hello.

Are the following dialogues grammatically correct?

The front curtain of the scenery was opened. Daniel walked on stage, playing Elvis.

Daniel began to sing and the kids who were in the auditorium, applauded him.

In the backstage Kevin and Bernard were watching the show.

-"Thanks for coming to help me brother, I really appreciate it.", Kevn said.

-"Don`t thank me Kevin, the family is the most important thing to me.", Bernard replied.

Kevin's father Frank talks animatedly with uncle Todd

-"You did a great job in wood flooring, congratulations.", Frank said.

-"On several occasions I had to work as a handyman in order to sell my hammers throughout the country.", Todd replied.

Kelly talked with his dad.

-"Thanks for coming to help Dad"

-"I will always be there for to you."

-"Hey! Don`t forget who was the chief constructor and the man with the contacts to bring the laborers!", Reuben said

-"You've been reminding us of that fact for the last two hours!!!"

Thanks!