Here is a family prayer guide that can take from 5-15 minutes which can be adapted for zillions of situations. Of course, it is even more fun and habitually reinforcing if you add sweets to the event or a nice setting like a fireplace. Sunday is a natural choice for a day to do this but it can be any time. Having a job for each member makes it truly feel like a “family” prayer. Try it once. Then try it again.