Under Iowa Code chapter 598.41(1)(c) (2007), the denial by one parent of the children’s opportunity to have meaningful contact with the other parent is a significant factor in determining the custody or physical care arrangement. See In re Marriage of Will, 489 N.W.2d 394, 399 (Iowa 1992); In re Marriage of Barry, 588 N.W.2d 711, 713 (Iowa Ct. App. 1998). The court must consider the willingness of each party to allow the children access to the other party. In re Marriage of Kunkel, 555 N.W.2d 250, 253 (Iowa Ct. App. 1996). A custodial parent’s lack of cooperation with the noncustodial parent’s visitation and communication with the children may be considered a substantial change in circumstances warranting a modification of the dissolution decree. See In re Marriage of Downing, 432 N.W.2d 692, 694 (Iowa Ct. App. 1988); In re Marriage of Grabill, 414 N.W.2d 852, 853 (Iowa Ct. App. 1987)…