Bealzebub,
Most of the time its on landing when you cant secure the kid, if the parent dos'nt and wont comply, obviously i cant off-load, but i will take further action...i.e a dissruptive pax log!! At the end of the day its safety first, spoilt kid last!
Obviously if you have someone having an "attack" or a seizure then you do the best you can to secure them, but thats a completely different story because its a medical emergency, not some spoilt kid having a tantrum