Happy early Birthday!! I don't know if the family coming in town will be bringing kids with them, but The Melting Pot is an awesome place to go for fun celebrations. It's a fondu place, and it is SO SO SO delicious. We use it for all of our special occasions. I wouldn't take kids there, just because there is a hot plate in the middle of the table, and your meal will take about 2 hours to enjoy in total. It's a great place for adults to go and visit while you eat delicious/quality food, but little ones would likely get bored.
If you will be taking kids, depending on their ages, you might want to try Jinbeh. It's a very relaxed atmosphere where they cook the food right in front of you. Very yummy stuff, and it's very entertaining.
Hope this helps.