The final scene uses facial expressions and body language alone, with no dialogue spoken, to pose three questions for the viewer to answer for themselves. First and most immediately obvious, is whether Edie can forgive Tom, and can the family move on and be a family again. Second, will anyone else from Joey's past come looking for him? (As Richie tells Tom/Joey, 'Boys in Boston are just waitin' for me to go down). Third and less obvious, is whether Jack will finish growing up with the same talent for violence as his father-- once pressed, he gave Bobby such a savage beating as to put him in the hospital.
While it's left ambiguous, the ending suggests his family welcomed him back. As Sarah, obviously not fully understanding what is going on, sets a place for Tom. Tom sits down, Jack passes food to him, while clearly still angry at Tom, still accepts him as his father deserving a place at the table. Finally, Tom avoids looking at Edie until the last moment. When their gaze finally meets, Tom's reaction is that of joy and relief. Obviously he could tell she still loved him and accepted him. As earlier in the film, Tom says to Edie "I remember the moment I knew you were in love with me. I saw it in your eyes. I can still see it."