Sorry to hear about it Mando.
If I may take this opportunity to reassure you: this loss of yours is an illusion. A painful illusion, but one nonetheless. You can never lose your son, because all of infinity progresses towards 7th Density (and may in fact be 7th Density, but that's just my interpretation) so no matter where Sergio ends up, his path and yours will converge inevitably.
You have my respect, and my condolences.