Answer:
Sensory interaction
Explanation:
Sensory interactions can be explained as the interaction of the senses with each other and how these senses influence each other.
One instance of the sensory interactions is smell and taste.
Thus in case of Daniel and his grandfather who has a problem in hearing and needs to face Daniel in order to understand and interact with him.
Here, apart from hearing, he needs to interact with help of understanding the gestures and facial expression of Daniel.
Thus here sensory interaction takes place in the form of the combination of the verbal and non-verbal form.