Pronunciation of consonants

Peter Piper picked a peck of pickled peppers. A peck of pickled peppers Peter Piper picked. If Peter Piper picked a peck of pickled peppers. Where's the peck of pickled peppers Peter Piper picked?

Tick-tock, tick-tock,
Ticks Tommy`s clock.
Tick-tock, tick-tock,
Ticks and ticks his clock.

Robert Rolly rolled a round roll around,
A round roll Robert Rolly rolled around.
If Robert Rolly rolled a round roll around,
Where`s the round roll Robert Rolly rolled around?

These brothers gather with their mother,
Those brothers gather with their father.
If these brothers didn’t gather with their mother,
Would those brothers gather with their father?