just rereading this thread and I saw you stated it doesn't seem right that the treatment provider is seeing the husband, wife and stepson...

here in America mental health treatment providers are legally and ethically able to see and treat whole families individually and together.

that's what the letters MFT (Marriage Family Therapy/ therapist) stands for. its so that couples, husbands and wives and their family can work separately and together with the same therapist on any issues that affect the marriage and family)

theres nothing wrong with the same therapist/ psychiatrist treating everyone in the same family here in America. in fact most if not all mental and physical health treatment providers here in America are licensed and certified to work with family members. its just how the mental and physical health system here in America works.

for example if I am having a problem I can see my therapist, and because my therapist is a MFT my wife and children can also go see her if they want to (and have)

another example my primary care physician is a individual and family physician so he not only helps me to take care of when I get a cold or flu or any other physical health problems he also treats my children and my wife when they have physical health problems.

here in America that's how the health system is a treatment provider can work with individuals and can also work with the family members.