Anyone looking from the outside in would tell you to kick your daughter and son-in-law out and get another counselor.

Your feeling worthless, rejected, frustrated and unhappy are all signs that your life is not working.

Your living situation are the external factors contributing to it.  The internal factors are your self worth which does not seem that your current therapist is helping in.

I know that solutions are easier to say than to do.

Wish you well.