Hi,
Welcome to mobileread ....
Sharing ebooks is a recurring topic here on the board, look in the News and Discussion forums and you'll find the topic in a number of guises.
If the books you have bought are DRM'd, then generally they are restricted to your reader....however you can find ways to delete the DRM restriction, if you look far enough.
If the books you have bought are not DRM'd, then the terms of the purchase may restrict their tranmission to another person.
Read all the ifs and buts in numerous forums and then make up your mind based on your conscience....
Otherwise find and read the free books - plenty of great ones in the
mobileread library ....