('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.
(..) This is exactly what I wanted. All of you against all of me. How can you possibly hope to stop me? Like the old man said. Together. Raaarrrr!!! Uhh! You know, with the benefit of hindsight.... Rarrrr! They'll try to leave the city. We can't let 'em, not even one. Rhodey! (..)2015 Avengers: Age of Ultron