We sent out our invitations and are now getting replies back. I just got one back today from a couple who we invited the husband and wife (so 2 people). However, on their reply they are bringing 5 people. A little background on this..my Grandpa has 11 brothers and sisters, so these are my moms aunts and uncles. We didn't invite any further down the line because we had to draw the line somewhere. So this one couple is now bringing their kids and none of the others are. What do I do? Should I just let it go or do I ask them to only bring 2 people? If I ask them to only bring 2, how do I say that without being rude?