It's...Complicate

Meet 33 year old Katherine or better know as Kat. Single mother of 2 son Axel 17, and daughter Serenity 16. Kat is the daughter of a gang leader next in line to run the gang. Kat feel in love with her English teacher when she was 16 Jax Hall, Jax was 23. Ends up that he is the leader of an enemy gang. Long story shot they end up together and have 2 kids together. When Kat was 18 they got married, her parents didn't approve but they didn't care. But 3 years after they got married Jax left and was in and out of Kat and her kids life for 1 year until he completely left for good. Sure from time to time she would see him when the kids and her moved around. But now these two are throw back together and with more complications than when they first got married. What is the secret and how does Kat, Axel and Serenity deal with all of this? You know what they say one small step at a time. After all both Jax and Kat are no saints.