No time to read other posts so hope I'm not repeating but .....
You could train him to always wait for your command before he takes any food. (easier said than done ) I have done this a little with the boys and tried to teach them some patience with taking food also as they would run and snap it out of my hand or the leave it command could be a good one. These two will pay off time and time again in other instances aswell.
Do you have access to an x pen where you can watch them both but there is some distance between them and time out for both?
The little girl could go in their while she is eating ?
Ha HA just kidding I mean for Dylan
Harry (tri) and Digby (blen).