Paternity

You
must be able to declare that
you
are the baby’s biological father,
or
married to
or
in a civil partnership
with the mother,
or
living with the mother
in
an enduring family relationship,
but
are not an immediate relative,
and
you will be responsible
for
the child’s upbringing,
and
you will take time off work
to
support the mother
or
care for the child.

On the HMRC Statutory Payment Pay/paternity leave form, page 1 (April 2010).