50th Anniversary dinner

Question:
I wanted to give my parents a 5oth anniversary dinner, however they would prefer just to go away for a weekend together because they never get away and they aren't that big into fancy parties. So, I decided to pay for a week-end getaway for the two of them as my gift to them, but I also want to have a scaled down version of a 50th celebration because I would like to involve family and friends. The family members that attend would be paying for their own dinner and I will be paying for the invited guests (friends). The problem I have is that we will all be in the same small room for the dinner. How do the family members pay their checks without the guests seeing them and wondering if they need to pay also. I can't figure out how some will pay and the others will be on my check. If you have any suggestions, I would sure appreciate it.
Christine
Answer:
You tell the waitstaff in advance the people who are your guests. They will put them all on your bill and the rest will receive a check at the end of the meal. One caveat--most restaurants will automatically add 18-20% to your check for 6 or more guests so LOOK AT IT to make sure you aren't tipping twice.