Who are 'his brothers" mentioned here?
Seforno, Malbim: They are Lavan's "brothers" (relatives) who came with Lavan. 2
Ha'Emek Davar: They are people that Yakov converted; they were below the mountain, and Yakov. They spent the night in the mountain with Yakov to protect him, for they saw Lavan's angry face; he was suspected of murder.
What is "Lechem" that he called to them to eat?
Why did Yakov slaughter for them to eat meat?
Bechor Shor: It is the way of Chasidim to make a Bris over a slaughtered animal - "Chasidai Korsei Vrisi Alei Zevach."