Example 1B: If grandchild "B1" had predeceased "A", leaving two children "B1a" and "B1b", and grandchild "B2" had also died leaving three children "B2a", "B2b", and "B2c", then distribution "per stirpes" would give one-third each to "C" and "D"; one-twelfth each to "B1a" and "B1b", who would constitute a branch; and one-eighteenth each to "B2a", "B2b", and "B2c".