We also do nightly family reading. My kids are 8 and 12. We read chapter books that make good read-alouds, but which might be too challenging for the kids to read on their own (at least the 8 y/o; the 12 y/o will read anything she can get her hands on!)
But there are a number of more sophisticated short reads that make good bedtime reading for bigger kids. My kids still both LOVE Rudyard Kipling's Just So Stories. Also, chapters from the Little House... books make good short reads.