Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,193
IB+ Oro and higher (but not their Oneworld equivalents) do get to bring their under-18 children into IB-run lounges. No idea if that applies to Business Class, since J passengers don't have guesting privileges.