Is it sufficient to offer bread, eggs, and milk as expiation for an oath, along with feeding some poor people in both the first and second expiations, especially given that the one offering the expiation is unemployed?

The expiation for an oath (kaffarat al-yameen) is determined by feeding ten needy persons with the average food one provides for his family. This varies according to people's circumstances and countries. It can be by giving them ownership of the food or by providing a ready meal. What you did by feeding the poor bread, eggs, and milk is sufficient, Allah willing, because it is considered average food. It is permissible to feed the same needy persons for multiple expiations, provided that the number of needy persons (ten) is completed for each expiation individually.