The Superior Court explained how custody jurisdiction remains in Connecticut when one parent moves out of State to another State as follows: If one parent remains in Ct an dcontinues to have a relationship with the child, Connecticut will retain jurisdiction despite one parent leaving with the child.
Edelson v Dubinsky 62 Conn.L. Rptr No 18, 2016

Or

In Shaw v Shaw 62 conn L. Rptr. 20 , 2016 The Court delt with the enforcement of distributing retirement benefits 10 years after one spouse left Connecticut . The court will uphold jurisdiction over Orders dividing retirement benefits if one party remains.