"would you take your five-yr-old to see the funeral procession? How 'bout a 3-yr-old?"
Definitely take the 5 yr old. It is a memory that will remain with him for the remainder of his life. The 3 yr old may have a little difficulty with the somberness of the situation but you have to decide that yourself.
You must know us!
Out of respect for others I wouldnt bring anyone under 10. How well can your kid sit still?