Question:
If I am reciting at Birkhat Hamazon at someone else’s house and we are benching together but there is not a mezuman (just the husband and wife), should I still include a harachaman for the baal/baalas habayit or this considered as if benching alone and thus say the harachaman for a yachid?
Also, what about a case where I am benching at someone else’s house, again there is not a mezuman (just the husband and wife), but we are not benching together.
Answer:
We say the Harachaman anytime that we are eating at someone else’s house or eating from their food, regardless if there is a mezuman or not, or even if the host didn’t eat together. We are giving him a blessing because he gave us the food. However if we eat in a restaurant and we paid for the food we don’t say the Harachaman.
Sources:
Aruch Hashulchan 201-3, M”B S”T ibid 14-15.