How can I connect siblings in the database?

You can connect siblings or other relationships under the Relationships tab in the database.
Select Add New to add a new relationship:
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Select an existing contact from the drop down, or create a new contact by clicking the green circle. You can select a type of relationship as well:
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Add the name of the new contact and click Save:
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Your new relationship will be added to the relationships tab on both contacts’ screens.
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If this sibling is also a mentee, you will want to make sure that they a have a mentee record, along with a new waiting case record to be matched.
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Note: You will need to manually attach a guardian for this mentee to sync the household together with one mailing address:
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