National Survey for Wales data also show that parents in deprived households are less likely to be supporting their children with school work, and also have less confidence to do so.
Mae data Arolwg Cenedlaethol Cymru hefyd yn dangos bod rhieni mewn aelwydydd difreintiedig yn llai tebygol o fod yn cefnogi eu plant â gwaith ysgol, a bod ganddynt hefyd lai o hyder i wneud hynny.