You just have to ensure that all your devices are using the same Notezilla.Net account. Once you do that, you just have to create a new note on one device and set a reminder. The notes automatically sync every minute.
This short video will show you how this is done:
Is your Windows system already syncing with Notezilla.Net account? If so, go to Android phone, Sync option and sign into your existing Notezilla.Net account to download all your notes on to it.
Next, when you create a new note on your Windows desktop and set a reminder, you will see the same note within few minutes on your Android.
Your wife also needs to setup another Notezilla.Net account on her Windows system and iPad. The steps are same as above. Just that she will have her own account.
Once this is done, go to a sticky note and choose Send To->Contact from the note menu and add your Wife's email address. Wait for her to approve you (an email will be set to her). Once approved, you will be able to send note to her. She will receive the note on all here devices.
This feature is explained in the short video given below: