Help emailing short videos from iPhoto
Since you uploaded the video using iPhoto they are in the iPhoto library on your Mac.

To show you where, select the video in iPhoto, now click on the File in menu bar and select show in Finder.

That will show you where the Video is on your disk.

Go to it and right click selecting share by email BUT:

The file is 177 MB (to large to send by email), so you need to upload it to the web (like your Google drive..ect..) a place where you family can access to down load.