If I wasn't one of the hosting families, I would love to have them on the same day. As another poster said, only tying up one Saturday rather than 2.
Just a thought, but maybe SIL didn't want a joint party because her style of having a party is different than sisters. I have a neighbor with a child graduating the same year as my son. She has talked about having a joint party for the kids since we are next door. This just wouldn't work for us. Love them to death, but our ideas of a party are pretty different and our friends and families would not be real compatible.
Could the OP's situation be similar? Even if it is, SIL should have just be up front about her intentions. Unless the plans of the grad changed, of course.
Just a thought, but maybe SIL didn't want a joint party because her style of having a party is different than sisters. I have a neighbor with a child graduating the same year as my son. She has talked about having a joint party for the kids since we are next door. This just wouldn't work for us. Love them to death, but our ideas of a party are pretty different and our friends and families would not be real compatible.
Could the OP's situation be similar? Even if it is, SIL should have just be up front about her intentions. Unless the plans of the grad changed, of course.