Some more ideas:
Pick one zemer from the zemiros of each meal and sing that same zemer with your kids every week. That way it’s easier for them to learn it then if it’s a different song each week, and they don’t get bored like they would if you try to get them to sing a whole bunch of zemiros in Hebrew. (We do this even with my slightly older kids, and it works well.)
Ask questions about topics they have learned about in school — Parsha, upcoming holidays, etc., and give out small treats (like chocolate chips) for each answer.
Let them bring the projects they made during the week to the table and explain them, or give each child a chance to say something exciting that happened to them that week.