BBM: Hold on a minute, we're getting carried away, I think. TM's parents do not need fifth amendment protection; they are not suspects in any criminal action.
O'Mara can't FORCE them speak to him, but they are allowed to speak to anyone they choose. Having a lawyer doesn't change that.
(IANAL and all that.)
They can speak at O'Mara, but he cannot speak to them without Crump's permission and in his presence. Crump didn't return phone calls from O'Mara which were intended to accomplish just that. Those calls were not returned. He could not speak to the Martins.