Congrats!
I realize it sounds shady, but the parent facebook groups for MIT are quite serious about “security” and you do have to provide full legal name and email addresses for all which they reference against the school’s list of admitted students. My year, they didn’t allow incoming parents into the general MIT parent group until late September although last year, it seemed like they allowed the new parents in earlier.
There’s a few parent moderators on the 2029 parent fb page who have older students, and they will pop into the general parent page to crowdsource info as needed for the prefrosh parents.