There is only one default file location in Word for documents. However, you
might be able to make some quick shortcuts for the different users. You don't
mention which version of Word or which operating system you are using. If
you are using Windows 2000 or XP, and Word 2000 or higher, this might work
well for you.
1) Create folders either in My Documents or on your harddrive for each
family member.
2) Open Word. Click the Open button.
3) Right click on the Places bar on the left (with the icons for My
Documents and Desktop). Choose "small icons".
4) Use the Look In dropdown at the top to display the location where you
made the folders in step 1.
5) Select, but do not open, the first family member's folder.
6) Click Tools up at the top of the box. Choose "Add to My Places"
7) Repeat for each family member's folder.
This will give a quick shortcut on the side of Open and Save As to each
person's storage place. It's easier than making different log in accounts for
all family members!