Same situation here. Going to submit SET(O) for my child under 18 who's currently Tier 1 (G) Dependent while we the parents are already on ILR. It seems to a no brainier the only support documents I think needed are the parents ILR (passports in your case). Did you submit anything more than that? In...

The situation 1. I and my spouse both have ILR after 5 years on Tier 1 (G) since a year ago. 2. We have a son as Tier 1 (G) dependent born outside of the UK. He could apply with us but I believed that he could skip ILR step (seems to not be the case). 3. I and my wife have both applied for naturalis...