Are the alpha kids birthdays the same as the beta guardians? i.e: Bro's birthday and Dirk's being the same? Or Jane and Nanna's, etc? Sorry, I'm confused about this. (The date, not the year of course)

The Alpha kids’s birthdays are the same as their Beta kid counterparts.

Dirk’s is the same as Dave’s

Jane’s is the same as John’s and so forth.