If you are buying a single adult ticket with a child ticket, then yes.Presumably you'll be able to buy single tickets in that area for non-season ticket holders?
Give the ticket office a call and ask them.Will they really turn me away from the area I have always sat in (13 years as a season ticket holder and now 2 years without one as I live away) if I'm prepared to stump up £20+ on the day?
I will have my child with me. And whilst I am happy to pay a child entrance price for him I suspect the club will object as he's 24!