No, Cyril is from a different time who transmigrated to the current timeline we are in so technically there is a paradox with two Cyril's. Odelli has a kid but that kid has blue hair and p much looks like his dad. Cyril is odellis nephew but that's it. Cyril's dad is Albert who is odelli's nephew lol her older brother gautier's son so...Cyril is gautier's grandson which I guess makes odelli Cyril's great aunt. A lot of twists and turns in this family tree

Okay, so either little and older Cyril are different cousins, or Cyril is Odell’s son and not Arthur’s? I recall early on thinking the time line was a little crunched for Cyril to be Arthur’s son since gautier wasn’t that old either