Would he have resigned to protect his Father's position in Watchtower?
I think if that were the case, Vintage, he would have resigned a long time ago. As LMsA said it's an inactive company and probably always has been.
I also agree with Simon that if Dijana divorced him (and there was any bad blood between them) getting child support wouldn't necessarily be a straightforward thing, particularly if he left Croatia. Establishing his having regular, reliable income could be tricky too.