Can the threefold blessing be said motzi others who ate different foods?

Question

Can the threefold blessing be said in one combined form motzi others who ate different foods requiring different versions of the bracha?

For example: I'm saying bracha acharona after eating cake and grapes and also wanting to be motzi for two others, one had cake and the other had grapes. Can I say the combined version of the bracha for hamichya and haeitz with everyone in mind?

If not, what should I do in this situation?

I'm thinking specifically of situations when an a parent is saying the bracha acharona for children but perhaps the same principle applies more widely.

Answer 1

This is an attempt to answer following my lecture of the question. Following Rabenu Tam and RI (1), Shomea Keone is a an expression which has almost a literal sense. If you use "the shomea keone din" when you are in middle of a passage in which you cannot interrupt, the result of shomea keone is that you made an interruption despite your silence.

So, the question is the equivalent of this: If someone needs to make al haets veal peri haets and he said (by mistake) al hamichia veal haets, is it good, or is there interruptions in middle of the bracha al haets?

Partial answer. If the is careful to use the din shomea keone for the needed passages only, there is no interruptions an its a good bracha acharona. But if he did use the din shomea keone for the whole bracha he listened, the question is as described in the first paragraph. And I can answer according to the bet yosef in hilchot purim who said that saying al hanissim when not needed is not an interruption. So it's good there is no problem.

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(1) Tosfot Berachot 2b

ור''ת ור''י היו אומרים דאדרבה אי שומע כעונה הוי הפסקה אם שותק