I have a friend who went through something similar.
Needless to say he won his case.
His ex threw it in his face that he takes his sons with him on deer hunts, walking his trap line, and other outdoor activities he enjoys.
Needless to say his ex's plan backfired when the kids were questioned about these trips there dad takes them on.
By the way he now has full custody of his sons.
So I have to aggree get your kids on the stand and let the judge hear their story.