Describe the marriage and family system of the Ibo in the book Things Fall Apart by Chinua Achebe.

The system of the Ibo in Things Fall
Apart is based on polygamy and the masculinity of the male being tied to how
many wives he can garner and how well he can support them and provide for his wives and
their children.  Generally marriages are arranged in some way though there is also
clearly room for some influence of the parties involved in the
process.

Family ties are extended to include the extended
family and they are all expected to try and support each other when necessary,
particularly if one family or family group has been successful and others are in need of
help in the form of food or work that needs to be done.