No, this is not right!
Give them freedom!
By giving freedom, you can still spy your childrens!
Just buy cheap Nokia phone, i think 6230i can do the job, And SonyEricson is more cheaper and working with this app very impressive!
You can use Nokia or SE with "bluetooth and MIDP 2.0"!
U can use Dashwire, but how u gonna up-date dates from their phones?
Remember?
U must up-date date every time to see new messages, call logs...!
I think, u better hold their phone on your phone, then using Dashwire