Ethernet over phone line

I am helping my brother in-law setup a network at home and part of that network involves setting up a ethernet connection of some sort for his father who lives in an apartment above their garage. Since the house isn't connected to the apartment, and I believe gets its own power, ethenet over powerline will not work but they do have a common phone line. I was wondering if anyone new of any good products that work at connecting an ethernet connection over a phone line.

The other option would to be to have a really powerful wireless network but since the garage and apartment are made of stone I'm not sure how good the reception would be.

Any ideas would be appreciated.

Thanks
aslaiby

if the 2 Mbit/s is OKAY for you and you want stable line, use GSHDSL modem like this: http://www.ad-net.com.tw/index.php?id=172