Hi, Parul!
I'd be happy to get you started on a magical itinerary! You did not mention any park hopping or water parks, so you may need to adjust for your ticket type.
Sept 15: Arrival day. Explore your resort, enjoy some pool time, or head to Downtown Disney
Sept 16: Animal Kingdom (9am - 6pm)
Sept 17: Epcot (9am - 9pm)
Sept 18: Hollywood Studios (9am - 8pm)
Sept 19: Magic Kingdom (9am - 9pm)
Sept 20: Time to head home. See Ya Real Soon!
I avoided days with Extra Magic Hours, assuming your boys need more of a "daytime" schedule, but adjust if you want to take advantage of early mornings or late nights. If you decide on Extra Magic Hours, take afternoon breaks if possible with rest in your room or some splashing at the pool.
I hope this is what you are looking for. If you need to restaurant suggestions or other ideas, just
let me know, I am happy to help! Have fun planning.