Am i a bad person?? Im trying to Help!!?

Im currently fresh outta beauty school im taking a little break its very needed lol, anyways, my aunt has 3 kids that i take care of let me add that she is married but her husband lives with his current girlfriend, so she goes to work at 5 in the morning dont get home till about 4 then has to put her uniform on for school so she leaves here at 5 then dont get home till about 1030 at night, by that point i have the kids in bed, so im staying with her, thats her schedule let me tell u mine, im up till 8 in the morning making sure 2 of the 3 kids are up and ready and off to school, i then go to bed for a couple hours when the 2 year old wakes up, i feed him then wait for the other 2 to get home they get home about 4 with the mom, they eat a snack and hang out, after mom leaves i get up and cook, home made dinners, get the kids in the shower pjs on and homework done always, there dad never calls me to talk to them never not even once, so today my aunt comes and tells me hey that day that the kids aunt picked them up did u feed them?? i said ya of course why?? she said that her mother in law told her that the kids said i didnt feed them, and she called there dad and told him, he was mad, so that family was talking crap about me, so i started yelling out of anger and said, look i watch ur kids i make sure there homeworks done they are bathed and in bed by the time u get home, they are up and ready for school everyday, when there father was here he wouldnt wake up to take the kids to school they have missed so much school cus of him, but when i watch them they are at school everyday, anyways my point is they make me feel like im a bad person, and it hurts i dont know what to do, im still gonna be here for the kids but how do i not let it get to me??