I think the highest temp our LOs have had is around 103/104 (Bee would remember better!). Charlie pretty regularly spikes into 102, but it usually comes down pretty quickly with a painkiller.
Personally, the highest I've ever had myself was a little over 105. I went to the hospital for that one but my temperature came down on its own and I got stuck with a huge bill that my insurance didn't pay for some reason.
What's the highest temperature your LOs have ever had? How about you?