In general our parents tell me the older child fit into their family beautifully. In birth order or out of birth order, they do well. Children who come home as an older child will be learning a new culture, language and family routines which lets everyone jump in to help them. There is great bonding in helping a child do a task. It lets the brothers and sisters interact over an activity, not just talking. It also establishes cooperation and a positive footing. One wonderful adoptive mom told me she begins her simple routines before they even get home. Like making the bed together, brushing teeth together. When the family goes out, each child gets something to hold like the map, the water bottles, the tissues. All working together, all part of the team. All these normal acts combine together to help everyone part of the whole.
In general families report to me while going through the first weeks and months home, language is an issue. Less and less families are challenged now because of translation programs. These translation programs are not perfect and they can cause misunderstandings so look for a bewildered look on your child's face and maybe try a second app or gestural communication if you think there is an issue.
Many parents say their child was excessively active once they were united in China. These kids need loads of physical activity on their trip. Activity(exercise) calms us all. These kids are going through such a big change some physical exercise will help your child be calm and more relaxed. Remember exercise, endorphins help us all feel better. Take a walk, go to the park and play with your older child, swing on the swings. Its a great sensory activity as well.
These children are great and need loving families willing to accept and nurture them. To help them bloom and be even more amazing than they already are.