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.