Join Date: Sep 2005
Location: HEL
Programs: AY Platinum, TK Elite, BT VIP, AA, BA, SK, DL, NT, WB + hotels
Posts: 8,758
My suggestion would be to call them as early as possible, when the cabin is still empty. It's unlikely they would release 4 seats in U so you'd neet o waitlist anyway.
Might be a bit complicated to combine family's award tickets and your own cash ticket – perhaps easier in this case to just book everyone on awards and make a separate DEL run or whatever if you need the points. Or ask them about the possibility to book J for yourself and Y for family, then use points to upgrade (50k both ways). The cost between Y and X isn't that big (due to YQ), and this way your family will also get some points.