Imagine dragon out of interest where is your son now? Has he got accommodation?
Your same situation as me it was a no brainer not to have a grown adult son in the house with a 10 year old when they have those issues.
I think at 19 theres so much immaturity and he will have his wake up call.
I do beleive making the decision sooner rather than later to kick my son out speeded things up and so got him to that wake up call moment sooner rather than later..but it wasnt straight away.