How about: "W, I'm talking to my lawyer about next steps, though I'm open to us working something out. I don't see why E shouldn't be with me instead, since your internship schedule is going to be quite erratic."

M37, S5
M-7y; T-8y
Separated 060410
Wife/son moved 022611
Wife serves d-papers 032011
I filed child custody 042012; obtained custody 070312
Bifurcated 103112