Why should a sister not be permitted to speak to her brother?

Perhaps if he were to speak to her brother?

Joe looked startled, seemed about to speak to his brother, then appeared to think better of it.

I had spoken to my brother in private only briefly since the night Art was wounded.

He seemed to bend, speaking to his brother, and after a moment the little fellow raised a hand to them.

She would not speak to her brother then, not after what he did to you.

But tonight she would be speaking to the Toymaster, not to her brother.

In thirty years, he had never spoken to his brother with such anger.

He'd spoken to his brother that morning, but of course Palmer wasn't any help.

I spoke to her brother, and he didn't tell me much of anything either.