▼ This verb is future indicative, and thus not subordinate to “grant” (διατίθεμαι, diatithemai) as part of the result clause beginning with ἵνα ἔσθητε ({ina esqēte) at the beginning of v. 30. It is better understood as a predictive future.

▼ The statement you will sit on thrones judging the twelve tribes of Israel looks at the future authority the Twelve will have when Jesus returns. They will share in Israel’s judgment.