As an attorney I would not be talking to mom if representing the son -- unless it was to find out what HER testimony was going to be. But she would NOT be sitting in on consults/meetings that I have with her son. No way, no how. That would TOTALLY destroy attorney/client confidentiality.
Parents should remember 3 things: Love your kids more than you hate your ex; when you have children the relationship with the other parent is until death; your children determine what type of nursing home you end up in.
Nothing stated by me should be taken as giving you legal advice or forming an attorney/client relationship.
Attorney-GAL in Ohio.
I've removed the knife from my back, polished it, and will one day return it -- long after you think I have forgotten.