Appologies if this is covered in another thread. I did some searches but couldn't find anything.

I'm scheduled to travel with my family of 4 (Children ages 12 and 10) on the upper deck of a 747 in May. I had booked 63 & 64 J&K for all of us, but 63J is considered an exit row. I have been told in the past in the US that anyone on the same reservation with children under the age 16 cannot sit in the exit row even if the children aren't in the exit row. However, the BA website lets me select 63J. Will this be allowed, or do I likely face having my seats changed at the airport because they'll realize we're not allowed to sit there. Thanks!