Oh Osc, a red ear sounds familiar
Bb's youngest had endless ear infections, we got to know all too well - please do tell her to get straight to the doc's in the morning if it's still like that, and certainly if he says his ear hurts, because the good thing is it usually clears really fast once they're treated.
Having said that, he could just as easily be right as rain!
I'm quite sure he'll be fine by Wednesday, and as for tomorrow, I guess that depends on whether they're happy to leave him with you. Bb used to insist he got the children for the weekend regardless (obviously if it was actually something properly serious that would've been different) and tbh it was never any real problem (the famous non-stop projectile vomiting weekend included lol, but that didn't start till we already had them)
x