Sly's Father was a Wise, Sincere, Witty, Father and accomplished Thief. Before he was murdered by the notorious "Fiendish Five," Sly's Father was an honourable thief that led the old Cooper gang. He entrusted Jim McSweeny with one of his families secret, the location of the Cooper Vault. 

His voice should be a mature, mid to deep voice. 

My first idea would be a Brian Cranston type voice, or something like Willem Dafoe. 

Any takes will be considered. Do whatever you think works best for you!