Our family of four (mom, dad, 2 kids ages 20 and 16) will be Seville from Dec 23 - Dec 26. What will be open and what will be closed on Christmas Eve and Christmas Day? Will the cathedral be open those days? Giralda Tower? Restaurants? Shopping? Alcazar?

We'd like to attend church on Christmas Eve. Any suggestions?

We'd like to see a flamenco show, but don't think we'd like to sit through a 2 hour show. Suggestions? We will also be in Madrid and Granada so could do the flamenco show in any of those cities.

Thanks, thanks, thanks!

On Christmas Day everything is closed in Sevilla except some bars and restaurants, so make profit of walking along the river or along neighbourhoods around city centre or touring the city with the new rental bike system in bike trails.(sevici.es)

I think on Christmas Eve you can visit the cathedral, Giralda tower and the Alcazar until 14 hours. That day El Corte Inglés is open until 20 hours, and most shops close at 14 hours.

On Dec.23 and Dec. 26 everything is open.

And for attending a church on Christmas Eve, here you can find a list of Misas del Gallo from year 2007. It must be similar for the coming December 24 too.
http://www.pasionensevilla.tv/index.php/Noticias/Misas-del-Gallo-I-Casco-Historico.html

Enjoy your stay!.