Problems registering other family members by text.

"During Text-to-Register, profiles and phone numbers are getting mixed within families."

In scenarios like this one, we recommend that there be a parent registration, and then once completed, it directs them to the child registration. In Text-to-Register, the initial registration is always going to be connected to the person who owns the phone, for example, the parent. As long as the parent or the person who owns the phone does the first registration, you won't have that problem.