Why would that make a difference? Otherwise in theory you could take Sunday and evening/night time work, and still claim a payment. The problem where is that its too difficult to tell the difference between someone helping out a family member and working on the black market. The issue being its too hard, or costly in time and resources to police it.
http://www.citizensinformation.ie/e...nts_and_work/jobseekers_benefit_and_work.html
http://www.citizensinformation.ie/e...nts_and_work/jobseekers_benefit_and_work.html