('Brit') a family 'on benefits' [=('US') 'on welfare'; receiving money from the government because of a low income or lack of income]
Since he owns the land, he thinks he should be free to use it 'for his own benefit'. [=in a way that is helpful to him]
He might be lying, but we have to give him 'the benefit of the doubt' and accept what he says for now.
(..) I Understand. You stay out of our lives. - You and your company. - If that's what you think is best. There's one more thing, I think it will be to the benefit of everyone especially David, if we kept this matter private. We don't want to damage Alex's legacy. Alex... Alex (..)2014 RoboCop