Looking on the internet deeply has found these results:

My father is in the teaching profession is the most popular phrase on the web.

My father is in teaching line 10 results on the web	My father is in the teaching profession 11 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Feb 23, 2011 ... My father is in the teaching profession. I am liking it very much. I like it very much. Let us discuss about this.

My father is in teaching line

10 results on the web

My father is in the teaching profession

11 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.