My approach would be to ask questions about the relationship they have with their parent(s) - Are they calling you to check up on him and that’s why he is telling them about his plans? Are they financially supporting him so he feel like he owes it to them to check with them before making plans? Is he just using his parents as an excuse to not have to commit to anything he doesn’t actually want to do?
Once you can get them to give you more information, gently try to reason with him. If that doesn’t work, you can let him go if it’s going to be a real issue, or you might encourage him to get therapy, especially if there’s potential/historical abuse going on.
My approach would be to ask questions about the relationship they have with their parent(s) - Are they calling you to check up on him and that’s why he is telling them about his plans? Are they financially supporting him so he feel like he owes it to them to check with them before making plans? Is he just using his parents as an excuse to not have to commit to anything he doesn’t actually want to do?
Once you can get them to give you more information, gently try to reason with him. If that doesn’t work, you can let him go if it’s going to be a real issue, or you might encourage him to get therapy, especially if there’s potential/historical abuse going on.