Proper etiquette with regard to Muslim death.

Etiquette 101 asked...

The Father of my client (very important family in there community) passed away yesterday. They are in there home town Singapore, I'm in California. I read your information about the preparation (very informative) I want to send them an email and put in some kind of Muslim reference so they know how much I care and how sorry I'm. Can I tell them I'll say a pray for the dead "Salatul Janazah" can I use that verbaige or is it incorrect. They know I'm sorry, there Father has been I'll for awhile, I would just like to say something more comforting then the norm. Especially since I have to send it via email & won't see them until they return to the States. Do I mention anything about salaam? Should I write about what a great family leader he was to his 7 children? Thank you for your help.