(Just reporting not supporting) As to suing another jw, the WTS does have an exception with this walk-around explanation: WT 1973, 11/15, p. 703-704
Questions From Readers
● Do Paul’s words at 1 Corinthians 6:1-7 mean that under no circumstances should a Christian take to court a case involving a fellow believer?—U.S.A.
Thus, for example, one who defrauded his Christian brother or who failed to provide materially for his wife and children would find himself outside the congregation if he did not repent.—1 Tim. 5:8.
The injured party could thereafter decide whether legal action should be taken in an attempt to force the guilty one, now disfellowshiped, to rectify matters. Of course, the injured party would want to take into consideration whether it would be worth the time and expense as well as whether the congregation could still come into disrepute by bringing to public attention the actions of one of its former members. If the wronged Christian conscientiously felt that God’s name would not be reproached and legal action was definitely needed, he would not necessarily be acting contrary to the spirit of Paul’s counsel if he were to take to court one who was no longer a part of the Christian congregation. Jehovah God has permitted secular authority to serve as his instrument in bringing lawbreakers to justice, and in this case the one wronged would be availing himself of legal help after exhausting the intracongregational means to have the wrong corrected. and here:There may even be times when Christian brothers conscientiously feel that they could go to court with fellow believers. This might be to obtain compensation from an insurance company. In some countries the law may specify that certain matters have to be handled in a court, such as wills that may have to be probated by courts. But this does not create adverse publicity or bring reproach upon the congregation. In handling such legal matters that would not affect the congregation adversely, Christians can be governed by what they consider to be best under the circumstances.