Cleft palate

My brother was born with a double hare lip and cleft pallet, he is now 39 years old. He is visiting me over Christmas and I would like to take him for a test dive in our club pool.
He seems to think that it is not allowed but I would like an answer from medical people with diving knowledge.

Unrepaired Cleft Palate is a contraindication to scuba diving.
Repaired Cleft Palate presents some points to consider:
It is frequently associated with hypoplasia (underdevelopment) of the Eustachian Tube and even after surgical correction of thepalate, the tubal dysfunction can persist.
The teeth can be crowded and deformed, and can interfere with easy retention of the regulator mouthpiece Eustachian Tube function and the ability to hold a regulator firmly in the mouth must be assured prior to consider undertaking scuba diving.
If Eustachian Tube function and mouth grip on the mouthpiece are normal, there would seem to be no significant contraindication to diving.