Hi Kami
Your story of your great nephew sounds kinda like my grand son and we found that it was aspartame (nutrasweet is one of many names for it) that caused the seizures. It was in some candy and the factor of eating heavily processed foods magnified the effect. (Top Raman is lethal for small children!) My grandson now hasn't had any more seizures  but we have him on a organic diet with NO  artificial  sugars or MSG or hydronated oils.  It has taken awhile He is also on a couple medications that are helping but causing hyper activity. Seeing a child in a seizure is very frightening!  Artificial  foods  even baby formula is suspect especially to the 2nd and 3rd generation of those who eat heavily processed foods. Food is medicine so take care to make sure it is good and healthy read labels!
It is a hard path to be on when your children are going through illness. I will keep your family in prayer!
                                                              
Leslie

Thank you as always John!!