Is there a way from where I can keep watch on other mobile screen?
Here's an article showing some options if you have a PC:

https://www.ibm.com/developerworks/community/blogs/mobileblog/entry/mirroring_an_android_device_screen_onto_your_desktop

In my limited experience, realtime viewing is tricky.  If screen snapshots are OK, I'd recommend Teamviewer as I've always found their products robust:

http://www.teamviewer.com/en/products/mobile-device-support.aspx