What were some friendship bonds the families had in Number the Stars by Lois Lowry?

In "Number the Stars" by Lois Lowry, the friendship bonds between the Johansens and the Rosens were strong and enduring. The families supported each other, shared resources during times of danger, and worked together to protect Annemarie and Ellen. These bonds were based on mutual trust, courage, and a shared commitment to do what was right in the face of adversity.