+Use the @code{\tweak} function to override nested tuplets beginning at the
+same music moment. In this example, @code{\tweak} specifies fraction
+text for the
+outer @code{TupletNumber} and denominator text for the @code{TupletNumber}
+of the first of the three inner tuplets.
+
+@lilypond[quote,ragged-right,verbatim]
+\new Staff {
+ \tweak #'text #tuplet-number::calc-fraction-text
+ \times 4/3 {
+ \tweak #'text #tuplet-number::calc-denominator-text
+ \times 2/3 { c'8[ c'8 c'8] }
+ \times 2/3 { c'8[ c'8 c'8] }
+ \times 2/3 { c'8[ c'8 c'8] }
+ }
+}
+@end lilypond
+
+Here @code{\tweak} and @code{\override} work together to specify
+@code{TupletBracket} direction. The first @code{\tweak} positions
+the @code{TupletBracket} of the outer
+tuplet above the staff. The second @code{\tweak} positions the
+@code{TupletBracket} of the first of the three inner tuplets below the
+staff. Note that this pair of @code{\tweak} functions affects only
+the outer tuplet and the first of the three inner tuplets because only
+those two tuplets begin at the same music moment. We use @code{\override}
+in the usual way to position the @code{TupletBrackets} of
+the second and third of the inner tuplets below the staff.
+
+@lilypond[quote,ragged-right,verbatim]
+\new Staff {
+ \tweak #'text #tuplet-number::calc-fraction-text
+ \tweak #'direction #up
+ \times 4/3 {
+ \tweak #'direction #down
+ \times 2/3 { c'8[ c'8 c'8] }
+ \override TupletBracket #'direction = #down
+ \times 2/3 { c'8[ c'8 c'8] }
+ \times 2/3 { c'8[ c'8 c'8] }
+ }
+}
+@end lilypond
+