Should I try to steer away a friend from a toxic relationship with their family?
Why do you think it's toxic? It's good that you care.
I don't know how to explain...
It's okay to help a friend out from a toxic situation. Make sure you have the facts right before doing something.
I really don't want my friend to be disappointed or have bad experiences if I'm wrong.
It sounds like you are really concerned about your friend, and that is great. It's very courageous of you too, and I really think whatever you decide to do will be the right course of action because you are wise beyond your years.