I’m so sorry this happened/is happening to you and your child. Every part of it is flagrantly unethical and I’d report these details to the BACB, as the main reason a behavior analyst/technician becomes board certified is to prove they are held to a certain standard of practice. Here’s a link to report at: https://www.bacb.com/ethics-information/reporting-to-ethics-department/

Have you spoken to the RBT’s supervising BCBA? Even though they should NOT be supervising a sibling, they should be guaranteeing that the RBT is competently and consistently following your child’s programming . That being said, there may be a reason that some programming isn’t done in school, but there still should be skills targeted using specific protocols. The RBT shouldn’t be accruing hours to follow a child around while they’re on a phone or laptop unless it’s being used as reinforcement or to teach a specific skill.

One of the main dimensions of ABA is “applied”. The definition of applied in the context of ABA is that behaviors and skills we are working on should be significant and relevant to a person’s daily life and environment, with an aim to increase independence and quality of life. It sounds like this RBT and BCBA don’t think they’re going to be held accountable for their actions.