Are you required to claim a credit ?

I wasn’t aware that relatives could be counted for childcare costs. Anyway I did NOT keep track of how much money I paid my mother last year IF any for babysitting. I’d already planned on NOT taking the dependent care credit anyway since it’s not often I pay for babysitting. When it asked did I pay fees I said no. Am I within my right to opt out of that credit ? Also I know now that relatives can be paid ... but what if the relative didn’t report it on THEIr taxes .. again am I required to for next year put them down for childcare services ? At this point I’ve only paid $40 this year