If they have not practised reading and writing, youngerchildren especially tend to forget much of what they have learned, making it hard to pick up where they left off.
Family fights between children from prior marriages and new spouses (especially when they are muchyounger) are common for families of famous and not-famous alike.
For the performances at the New Victory which does not present opera on a regular basis, but chooses productions as they emerge the demographic is expected to be broad: Though the opera is billed for children ages 8 and up, at previous performances Mr. Bruce found that muchyounger listeners also handled it well.