Who is Margaret O'Koren from Dreamland and what is their importance?

Margaret O'Koren is Caitlin and Cass' mother. She is married to Jack. Margaret is very involved in her daughters' lives, though there is a specific emphasis on her involvement with Cass. When Caitlin is chosen for the cheer squad, her mother puts all her energies into helping with schedules and fundraisers, and when Caitlin is placed in rehab, Margaret creates a schedule that ensures Caitlin will have a visitor on every visiting day.