I'm living in a patchwork family and this question is about my 15 years old stepbrother. He is about to decide for an apprenticeship but the problem is that he doesn't show any particular interests towards what he signed up for. He mostly takes the suggestions from his dad and halfheartedly applies there (at the moment he's signed up to get an apprenticeship for business informatics).
To his personality and skills: He is a very silent person; during meals (we are 7 people) he never initiates a conversation and if asked a question he responds with a slightly awkward, growling voice and never tries to continue the conversation. He's not very skilled with his hands or possesses good fine motor skills. He had to ask his dad multiple times for clarification when cooking ramen noodles. His only interest I can identify is playing video games.
Me and my mom (not his mom) have discussed this many times and none of us could come up with anything he might be interested in so I think it is up to him to identify his interests. But since he also doesn't actively try to find something he's interested in, what are things me and my family could do to motivate him to do so?