I would still take pictures in full resolution and then resize on the computer, save as a copy and send. That way you have something to work with if you want to print photos later on. If you do not have Photoshop / Paint Shop / etc. or find them too complicated, you could get free IrfanView. It's easy to use and has a batch conversion options. By resizing photos to 1600x1200 it will take about 250kB per photo and with most e-mail account accepting now 20MB you would be able to send 80 pics in single email.
Or as few of us already mentioned - share photos online. All your familly will need to view / save / print an online gallery is a web browser.
Edit:
you can download IrfanView
here