Just for laughs: 2 + 2 is?

A little boy was doing his maths homework & saying:
2+5, the son of bitch is 7
3+6, the son of bitch is 9

His Mom: What are you doing?
Boy: I'm doing maths homework
Mom: this is how your teacher taught you?
Boy: Yes

Infuriated, Mom asked the teacher the next day
"What are you teaching my son in maths?"

Teacher: Right now, we are learning addition.
Mom: you teaching them to say 2+ 2, the Son of bitch is 4?

Teacher after laughing: What I taught them was, 2+2, the sum of which is 4...