would you object?

[Gina]

If it weren't for your MIL and SIL I say don't go, but you explained the situation, Like I mentioned before and Janet did to, you have to tell them that you are bringing a guest, don't just show up. It is right to let them know. Can you talk to your SIL? the one who is hosting the dinner, it is her house? If not just have your MIL or your other SIL call and tell them. I just got a thought have Katie call her aunt or uncle...I hope it works out well.... Good luck!