I would not sign her in. You did the right thing. What if she got hurt? THe parent can say they didn't sign the waiver--and who is responsible--when they find out that you signed the sheet?
If I knew the parent, I would have called and said--did you know you have to sign a waiver? My child thought I could do it for you, since I was there (not sure I would mention they called me to sign and you were home) and that you might want to go back and sign they can be there
I think you did the right thing, besides you also showed ds that someone else can not sign if you are not there--and reasons why.
Of course he was upset, that is normal, they all think they can talk us into doing things and he really wanted it--probably told the person, my Mom is easy going and will do it for you---and was upset to have mud on his face when you said NO--
I have seen it all the time where people drop off kids and expect to be able to partiicipate--once we were at Extreme Trampoline , and someone did not have their waiver--my child thought I would sign it--since the parent had dropped them off--but NO WAY--if they got hurt--the parent could say I didn't sign it--and we would be liable--NOT WORTH IT in my opinion!!
DS was THRILLED out of his mind HAPPY to go on a field trip with his after school group to Extreme Trampoline. They got allll the way there with the parent permission slips (school's requirement) to find out they needed the actual PARENTS there to sign the waivers
Was a LONG SAD bus ride back to Waukegan.