Nothing is known about Ryan and Zac's past.
Ryan is the more dominant twin of Zac. He speaks in a Cockney dialect and is interested in judo. He gets up to mischief with his twin Zac, and Maxy. Ryan doesn't usually take no for an answer. He is also often seen wearing baggy, oversized shirts. Ryan is also very handy and is quite a business man, as he charged Justine when she asked him to fix her clock, but said it was on the house when she told him that Tracy Beaker broke it.
Ryan and his twin disappeared with no explanation to their whereabouts between seasons 1 and 2 of The Story of Tracy Beaker. They either got fostered or moved to another care home.
Writer Elly Brewer confirmed on Twitter that Ryan and Zac's surname was Patterson.