Jill Duggar's eldest son Israel has celebrated his sixth birthday with a special day filled with his favorite things.The mom-of-two shared several stories on social media about her young son, calling him her "sweet boy."Jill revealed he "had his favorite cereal for breakfast" and "heard his birthday announced on the radio".MORE: Jill Duggar reveals the surprising way she is parenting her childrenWATCH: Jill Duggar admits visiting her parents home is "not good for her mental health"He also made