When was the last time you prayed together with someone else?
We are taught to pray “our Father.” “Our” is plural. “Father” implies siblings.
James M. Grier:
To approach God as Father implies the whole shared relationship of family. The stress seems to fall on the relationship of God to the church with secondary emphasis on the individual and relationship to God. James M. Grier
See also Christianity is against individualism quote from Cornelius Plantinga.