I have two, 1 yr and 1 1/2 years!
Have not bred, and do not intend to. My understanding is, though, that pet caiques make lousy parents and are difficult to breed. They also learn childcare from other caiques, so having at least 3 breeding pairs is recommended. Pet pairs tend to not feed their babies, making hand feeding from day one necessary (so, feeding every 1.5 hours=no sleep for you for several weeks) It's one reason they are more expensive than some other similarly sized birds.
They also do best when they pick their own mate. That's why three of each sex is recommended. You set them up as young birds and allow them to pair off naturally, then seperate them. Right now, getting a young caique and expecting your 5 year old to choose it as a mate is a long shot. Kind of like putting a toddler in a room with a 25 year old and expecting them to be best friends, and eventually make babies together.