Ivorian midfielder praises his sibling's mental toughness and insists he is the most important person in his life, dedicating the Wembley goal to him and the result for the fans
The Ivorian's second-half strike proved the only goal of the game as City sent their cross-town rivals tumbling out of the FA Cup with the 1-0 defeat in the semi-final at Wembley.
The former Barcelona holding midfielder praised the influence his brother has on his career, insisting Kolo has the mental fortitude to return triumphantly from a pending drug suspension.
"I am very sad for him at this moment in time," Yaya Toure said of his brother. "He is a professional player and he wants to play.
"People make mistakes sometimes. It is part of life. It is part of sport. Mentally, he is a strong guy. He is the most important person in my life.
"Every time I speak with him he helps me. I dedicate this win to him and the fans."
Toure excelled in an attacking midfield role against United, and he knows the result was special for the City fans.
"I am very happy," the 27-year-old said. "We have beaten our big rivals, which is fantastic and we are going to enjoy it.
"I am really happy for the fans. They have been waiting 35 years for a trophy. It is a long time.
"I think this is going to be the year for Manchester City. But it is not finished. We have to take a second step.
Manchester City will face the winner of Sunday's semi-final between Bolton and Stoke City in the FA Cup final on May 14.
Toure insists he isn't concerned as to the opponent, assuring fans that his side are also focused on qualifying for the Champions League.
"I am not bothered about who we play," said Toure. "They both have enough quality to win the FA Cup but we will be very hard to beat.
"It is our target to reach the Champions League and we are working for that."