The WT is deliberately trying to deceive the Court when they say crap like that. If called up about it, they say, "When we say family, we are only referring to those who live in the same home. We weren't including other relatives."
Here is what their actual policy is. It speaks for itself.
WT 11/15/52 p. 703
Questions From Readers
In the case of where a father or mother or son or daughter is disfellowshiped, how should such person be treated by members of the family in their family relationship?—P. C., Ontario, Canada.
God’s law does not allow a marriage partner to dismiss his mate because his mate becomes disfellowshiped or apostatizes.
(And then further down…)
The marriage partner would render the marriage dues according to the law of the land and in due payment for all material benefits bestowed and accepted