Ad hoc babysitter

Looking for a babysitter to look after 2 of my 3 children once a week when I bring my eldest to OT sessions. At the moment I am looking for someone for about 3 hours every Tuesday. One week it would be from 14:30 - 17:30 and the other week it can be anytime in the mornings and would only be one child. Based in Ashington just off the Navan road Dublin 7. Also if works out there would be other ad hoc hours for other appointments etc if suited. Please let me know if you are interested. Many thanks. Erika