A while back I made a little booklet for chanting that had a preliminary homage and the Discourse on Loving Kindness for the morning and a closing homage and the Five Recollections for the evening, as well as a guide to the Uposatha days, precepts, refuges, etc.
I could upload it for you somewhere if you'd like. I think it's all taken from Thanisarro's link above though, so you could just make your own.
Great to hear your kids are interested!
Gain and loss, status and disgrace,
censure and praise, pleasure and pain:
these conditions among human beings are inconstant,
impermanent, subject to change.
Knowing this, the wise person, mindful,
ponders these changing conditions.
Desirable things don’t charm the mind,
undesirable ones bring no resistance.
His welcoming and rebelling are scattered,
gone to their end,
do not exist.
- Lokavipatti Sutta