To dream that someone has been kidnapped, indicates that you are not letting aspects and characteristics of that person be expressed within you. You are trying to contain and/or suppress those qualities of the kidnapped person.
An eight yr old boy can have a lot of qualities that you as an adult do not.
To ease your mind take normal precautions about his safety.
You may want to contact some support group to get ideas of how to best deal with that. Like walking home from school with friends, or having a neighbor watch him if you're working etc.
I grew up in inner city Chicago. My folks didn't seem to worry about my safety, so neither did I.
I sincerely hope that you don't have to worry either.