The zoo have announced 2 more Brown Bears called Henk and Eso from Naturhelpcentrum in Belgium, the same place they received the original 3 females from. This will bring Five Sisters up to 4 Bears. The zoo have said adaptions will have to be made to house the 2 new arrivals.
The 2 new arrivals are siblings although I do not know if the original sisters are related although I do know they do not live together. I don't know what subspecies they are, sorry.