That's the big question that runs around my little pea-brain - most of the money must be gone, why not cut ties and let her parents care for her? Being with another woman and having kids with her would seem to negate the "loving husband that just wants what she wants" excuse.
There is some really virulent evil tangled up in this...
Forgive my tinfoil, but I believe that the man is concerned that if the parents gain custody, she will thrive under their care and eventually reach the point where she might be able to tell what happened to her.
How did Terri end up this way by the way? Hmmmmmm?