Diego Costa training with Chelsea |
Costa is currently serving a three-match ban following his actions in the Blues' 2-0 win over Arsenal earlier this month.
The Spaniard flung his arm in Laurent Koscielny's face and was lucky the incident wasn't spotted by referee Mike Dean.
But Jair thinks his brother's issues have been apparent since childhood.
"This isn't something new. It's the same old story," Jair told The Sun on Sunday.
"It's hard for Diego to change a habit of a lifetime. He always loses his temper easily and ends up in fights when he plays football.
"As brothers we've always been close but always fought over football because we were so passionate about trying to be better than the other.
"He never wants to be beaten and, as a child, if his team lost or he disagreed with a foul, he would fly into a rage ending up in scraps with his opponent."
Diego Costa (right) is currently serving a three-match ban |
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