Booked a few flights for myself and the family, i would be grateful if someone could offer advice on the following:

1) Booked 2 F tickets to Vegas using a Joker , 2-41 and GUF2 , as i am GGL and my wife Silver , we are unable to book 1A and 1K , due to my wife being Silver?
2) Booked a BA code share to MAD with IB in Business , how do we reserve seats? do I call the GGL line to reserve seats on IB ? or call Iberia ?
3) As i have a CCR card , are we all able to use the CCR lounge at T5 ( 3 passengers ) i believe i am allowed 2 guests?

Thanks in advance