Wow! I think we are in the same boat on this. D14 is my W's buddy. She does not mother her but rather hangs with her. MLC is so messed up.

M17 yrs.
me49
xW47
d15
d11

BD1-Jul/11(Affair found out)
Therapy 9 months (tried 2)
BD2- May/12(sep)
Court Jul/13 - I got 50/50
Sold home - Aug/13
Court #2 - Dec/13
Court#3 - Apr/14 ... She lost again
We settled.