Turn a spreadsheet of phone numbers and addresses into the file the site reads.
In Excel or Google Sheets choose Save as (or Download) and pick CSV. One row per boy. Any columns you have are fine — you say which is which in the next step.
Anything left as “not in this file” is simply left blank. Only the name is required.
This downloads contacts.js. Put it in the site's
assets/js/ folder, replacing the one already there, and upload the site
again. The details then show on the Family Details page and on each boy's profile.