<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping  PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
   <class mutable="true" name="Mutter" table="mutter">
      <id column="id" name="id" type="java.lang.Integer" unsaved-value="0">
         <generator class="native" />
      </id>
      <property name="name" column="name" not-null="true" type="java.lang.String" />
      <set name="kinder" table="kind" inverse="true" cascade="all">
         <key column="mutter_id" />
         <one-to-many class="Kind" />
      </set>
</hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping  PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
   <class mutable="true" name="Kind" table="kind">
      <id column="id" name="id" type="java.lang.Integer" unsaved-value="0">
         <generator class="native" />
      </id>
      <property column="mutter_id" name="mutterId" not-null="true" type="java.lang.Integer" />
      <property column="name" name="name" not-null="true" type="java.util.Date" />
      <property column="geburt" name="geburt" not-null="false" type="java.util.Date" />
   </class>
</hibernate-mapping>

session.beginTransaction();
Mutter mutter = new Mutter();
mutter.setAtr.....();
session.save(mutter);
mutter.getKinder().add(new Kind());
mutter.getKinder().add(new Kind());
session.getTransaction().commit();
session.close();

Mutter mutter = new Mutter();
mutter.setAtr.....();
Kind kind = new Kind();
kind.setAtr....();
mutter.getKinder().add(kind);
mutterDao.saveMutter(mutter);

public void saveMutter(Mutter mutter) {
   getHibernateTemplate().saveOrUpdate(mutter);
}

Mutter mutter = new Mutter();
mutter.setAtr.....();
mutterDao.saveMutter(mutter);
Kind kind = new Kind();
kind.setAtr....();
kindDao.saveKind(kind);
mutter.getKinder().add(kind);
mutterDao.saveMutter(mutter); //bzw. session.getTransaction().commit();