Work Together Time

I feel that it's important to have a common homework time because one sibling who's doing homework might feel quite demoralized when the other is playing. So if Pb is doing work and she sees Rb playing, she will feel sad. Thus to motivate each other, I would try to plan both of their study time together, even if the other may not have formal academic work to do. This will teach them to work hard together and also play together, thus building up their sibling bond :)