It appears the kids are calling the shots here. Forgive me, but I am unclear to your status...Is a divorce pending? If so, make sure you have a clear and easy to understand parenting plan in place. Then, if the kids do not comply with you, they will be unable to hide at H's house because then HE will be in violation as far as the courts are concerned.
Sometimes love is not enough with kids. Sometimes we must make choices they disagree with because it is what is best for them. The kids will not understand until they are adults but someday they will understand...