Fiance showed me his fire Amazon account that has free fake number downloaded

So fiance showed me his fire Amazon account which is only use for his daughters tablet. Which his daughter doesn't live with us. So on feb 6 a free fake number app was downloaded same with gmail. My question is if it was downloaded on the tablet. Can my fiance use that app on his phone? His daughter is 7 years old. I find it weird. Am wondering if fiance downloaded those apps. Cause in feb in paid porn girls. Found out by looking at his bank statements. Just looked at bank statements and on feb 6 he paid porn girls. So I'm guessing it was him downloading that app. Should I ask his daughter