# Israel blessed Joseph

Here "Joseph" also stands for Ephraim and Manasseh. Since Joseph is the father, he is the only one mentioned here. 

# The God before whom my fathers Abraham and Isaac walked

Serving God is spoken of as if it were walking before God. Alternate translation: "The God who my grandfather Abraham and father Isaac served"

# who has cared for me

"who has cared for me like a shepherd cares for his animals"