Yes – Jonah just assumes Brad & Toni are happy to care for Shannon any time Jonah has something else to do. I would think hot shot actor Jonah has a girlfriend sometimes. She could help look after Shannon – but Jonah just assumes Brad & Toni are always available – not that they would have any plans of their own…
Yes it has been a burden to Brad & Toni sometimes. Jonah has shown up bringing Shannon without notice on occasion – not even asking.