Yes absolutely! Kym loves involving older siblings in the shoot.
Sibling shots are usually the first to be taken so that the older sibling can then relax while we pose the baby. It is advisable if the older children are quite young, to bring another adult. They will need to take care of those children while the session is continuing with the newborn. Perhaps they can go for a walk or drive them to the local park etc. The older siblings mustn’t become a distraction for the baby.
During the session, don’t try to force children or pets into doing anything. Very gentle coaxing is OK, but it’s usually best to leave this up to the photographer. Talking to the child or pet will take the focus away from the photographer’s camera.