Before you said that there was too much tension for the parents to be at a party together, and the tension wasn't good for the kids. Now you're saying the kids will think the parents are getting back together? Even with all the tension that you said the kids will pick up on? Sounds like a lot of rationalizations here...
HUH what? You just spun it around to make it work for you. What I said is IF they keep it up and things might get better it is still giving the kids a false sense of hope. Pretending to be a family is wrong if they have no intentions of getting back together.
You guys might want to spend a little time a step family board and get a new perspective about blended families.

