How far will Jack go to ensure Charlie doesn't take his son back to Ireland?

Charlie is back in Walford seemingly intent on having a huge say in the future of his biological son, Matthew, in EastEnders.

While Dot is delighted her grandson is back, Jack – needless to say – isn’t. In the wake of Ronnie’s death, the stepdad has been bringing up the lad as if he was his own flesh and blood, and is likely to do anything to stop Matthew from being taken away from him… Can Dot possibly find a way to resolve the pair’s bitter battle?