Thanks. The NC Relay looks as an interesting option, but still not sure if it could be applied to the 2-way or 3-way switch circuits for controlling and monitoring the status of the circuit.
I'm sorry, I couldn't exactly get the circuit diagram you explained. Would be great if you can help me with some visuals.
From what I understood: in addition to the traditional light-switch circuit, one terminal of the switch is connected to the arduino and the other is connected to the NC relay. Please do let me know if my understanding is correct, before I go further on this.