One of the most menacing attacks on any single parent or stepfamily home is an ex-spouse who, because they're a parent, gets to be like a terrorist living next door. The temptation is to get drawn into the game-playing. Of course, that never works. What could work is praying for God to soften their heart and for them to realize they are only hurting their children. Pray for yourself, too. Ask God to help you to endure the persecution and to give you daily wisdom as you respond to the negativity.