A new student who is a sibling of a current student can be created quickly from the existing student record.
1) Find the student currently attending school and click on the icon to go to their basic information.
2) Click on the Siblings tab
3) Click on Add a Sibling
4) Enter the new student's name, select their gender and click Add. A record will be created with the same contact details as the existing student.
5) The new sibling's record will appear at the bottom. Click on the icon to switch to the sibling record to update the remainder of the details.
Refer to the article on Student Processing to complete the setup of a new student.