Don't share the challah

Hi,

Where there are only two challah loaves available at a Shabbat family, and multiple families are eating, they should have one person recite the blessing on the challah for all of them. The strategy of having multiple people recite the blessing on the challah in sequence before cutting it is not acceptable, for multiple reasons, one of which is the interruption that would generate between reciting the blessing and eating.

(Rivivot Ephraim 1:203)

Have a good day,
Mordechai