Plural forms are common when the group is seen as a collection of people doing personal things like deciding, hoping or wanting. Singular forms are more common when the group is seen as an impersonal unit. Compare:
– My family have decided to move to York. They’re going in April.
The average family has 3.6 members. It is smaller than 50 years ago.
– My company are wonderful. They do all they can for me.
My company was founded in the 18th century.