Answer:
Once they sailed the sea, now they surf the web
Sleeping during the day, I hide away. Watchful through the night, I open at dawn's light. But only for the briefest time, do I shine. And then I hide away. And sleep through the day.
Iron roof, glass walls, burns and burns and never falls.
A muttered rumble was heard from the pen, and I, in my walking stopped to look in. What was this I saw? A massive beast, hoofed, and jawed. With spikes upon its mighty brow, I watched as he struck the turf and prowled. And yet for all of his magnificence, he couldn't get out of that wooden fence.
Hard to catch, easy to hold. Can't be seen, unless it's cold
I am your mother's brother's only brother in law. Who am I?