Nid oes gan rieni hawl awtomatig i dynnu disgyblion o'r ysgol i gymryd gwyliau yn ystod y tymor ysgol. Ar y llaw arall, gallai fod amgylchiadau sy'n gwarantu caniatáu i ddisgybl gymryd amser i ffwrdd o'r ysgol yn ystod y tymor ysgol. Penaethiaid, felly, sydd yn y sefyllfa orau i wneud y penderfyniad. Mae Rheoliadau Addysg (Cofrestru Disgyblion) (Cymru) 2010 yn datgan bod gan benaethiaid bŵer disgresiwn i roi caniatâd i ddisgybl fynd ar wyliau teuluol yn ystod y tymor pan fo rhieni yn gofyn am gael gwneud hynny. Ar wahân i amgylchiadau eithriadol, ni ddylid caniatáu mwy na 10 diwrnod o absenoldeb at y diben hwn.
Parents do not have an automatic right to withdraw pupils from school for a holiday during term time.  However, there may be circumstances that warrant a pupil taking time off in term time and this is why head teachers are best placed to make the decision.  The Education (Pupil Registration) (Wales) Regulations 2010 state that head teachers have a discretionary power to authorise leave for a family holiday during term time where parents seek permission.  Except for exceptional circumstances, no more than 10 days’ leave should be granted for this purpose.