What is the test for determining whether a child who unilaterally ends a relationship with one parent unilaterally terminates their relationship with the other parent without any apparent reason?

The last enumerated factor was considered in Law v. Law (1986), 2 R.F.L. (3d) 458 by Fleury L.J.S.C. were he stated at p. 463: I am of the view that where, as here, a mature child unilaterally terminates a relationship with one of the parents without any apparent reason, that is a factor to be considered by the trial judge in determining whether it would be “fit and just” to provide maintenance for that child. A father-child relationship is more than a simple economic dependency. The father is burdened with heavy financial responsibilities and the child has very few duties in return. It seems reasonable to demand that a child who expects to receive support entertain some type of relationship with his or her father in the absence of any conduct by the father which might justify the child’s neglect of his or her filial duties.