Teach them to help each other out as much as possible. They can do a lot of things that you can't sometimes.
Know your weak sections so that you can look through the score and see if you need to focus on anything that will get them.
Be comfortable with common accidentals (Bb, Ab, F#, etc) so that you can call out a reminder of the fingering if it happens in an instrument that may need help.
And be calm. Dont let your kids see you stress. Good luck.