I recently introduced me son to D&D 4e. There is only the two of us, so I'm expecting death to occur more frequently. I want to implement a house rule that upon death (especially if we get a TPK event) you have the option to either wait for the other character to get to a temple/cleric for a normal res and no penalty other than spell cost (the normal res penalty is a bit harsh for a 2 player campaign IMHO), OR you can take an XP penalty and "respawn". What I'm looking for is suggestions on how much XP should the characters lose.
For a bit of context me son is 5, and much more interested in combat than "talking their way out of it".