My DC are similar ages to yours (ages 13, 10, 8, 5, & toddler). We are using Penny Gardner’s Bible readings. Each week we do 2 days of OT readings and 2 days of NT readings. On the 3rd day of the week, we follow the Epistle reading from SCM’s Middle Ages guide. I’ve found these readings to be a nice length…most are a chapter or slightly less. We follow the reading up with narration.