In my opinion,I think there are some ways that adopted chinese chindren can learn both chinese culture and adopted culture.First,they can celebrate the chinese holidays with their families.Secondly,they can read and listen chinese stories or songs,just let them contact chinese culture often.Thirdly,their families could invite some having the same situation's children to their homes and befriend them.Of course they can learn chinese language when they are in a earlier age,then they can learn it well,but I afraid there is no situation to use or say it.Finally,learn a few chinese culture couldn't help them to know about China,but could let them know who they are and where they were born on.But it maybe make them feel different from others.So western families must put their love to them,let them feel they are in a secure,love family.They are part of families.

This is a difficult problem to solve it.Maybe they can tackle it well,I wish they could.Whether the methods are good or not,I just believe if they try them best,I think they will see the effort.