You have done the tough part. You have cut off all toxic and narcissistic family members. You have set clear boundaries. You have a life free from their negative influence and behaviors. Then, suddenly, a new variable is introduced. It is the new additions, the future generation.
This would involve when you decide to have children. Also, the future children of other family members, like siblings and cousins. Since you became wise to their games and manipulation trips, they have lost leverage over you. Since they become volatile over time, they burn bridges that are very hard to reinstate. The next default setting is to make attempts by gaining access to you via a proxy. It is very much like how they would use flying monkeys to gather information from you. If they can’t hoover you back in, they use children as a way to dangle candy your way. It would involve getting back in contact with you to announce that someone is expecting. You would hear their fake excitement when they announce that you’re going to be an uncle. Another tactic they use is to pry into your own life and find out if you have any children.
As harsh as this sounds, the best thing to do is to ignore it. They show you pregnancy scans and newborn pictures to try to get you back. They’re trying to use a fake moral compass; surely no one will ignore a newborn baby. They see this as a way to get back into your life. It is not genuine. Besides, the newborn baby has no agency. They can mold them to whatever they want. It is like how they were brought up and became who they are, unfortunately.
Son in the Shadows: "Navigating Life as the Black Sheep of Narcissistic Parents" 