No use for grief:

Response: After a Sand Snake character is killed, kneel 1 influence to search your deck for 1 Sand Snake character, reveal it, and add it to your hand. (Kneel 3 influence to search for any number of Sand Snake characters and put them into play instead if The Red Viper was just killed). Then shuffle your deck.

May I use the 2nd part of the event independantly, or do I need a Sand snake char being killed to trigger the second part of the response?

Thank you guys for explaining.

Kordovan said:

You either use the "kneel 1 influence to..." effect after a Sand Snake dies or you used the "kneel 3 influence to..." effect after The Red Viper dies. It's one or the other.