My son is 8 years old and made his first Holy Communion this past May, as well as first confession before that. This past Sunday he complained of having a stomach-ache, and was able to convince me to let him stay home as I and my younger son went to Mass. In the afternoon our family went out to eat and he was able to eat just fine. When I asked him how his stomach felt afterwards he said it was all better. Our parish has a 6pm Sunday Mass, so I told him we would go. He said ok, and then said he was tired, but he knew that wasn't going to cut it.
Luckily we didn't have any Sunday evening plans already, but what if we did? Assuming he truly wasn't feeling well at the time we went to Mass, what are our responsibilities if he feels better during the day? What if we had plans to meet someone for dinner or something? Am I obligated to cancel our Sunday evening plans in order to get him to Mass? Or would it be an "excused absence"?