This might seem like a "funny" question. I don't think this would be permitted and I really have no basis to think why it should be however I'm trying to work out why this wouldn't work (or perhaps ...
Do all those who will be cooking in the house need to be present when the Eruv Tavshilin is made, or can one person per household make it, and everyone else benefit from it?
Do married children in their parents' home need to make a separate Eruv Tavshilin if they are staying in their parents' home and their parents are making an Eruv Tavshilin already?
In the Eruv Tavshilin we say when there's holiday followed by Sabbath, the proclamation is: This eruv ("merging") shall allow us to cook, bake, insulate, and kindle on the holiday in preparation ...