Unfortunately, both Hank and Janet, as well as their daughter Hope, were among the half of the universe snapped out of existence by Thanos, and Scott was consequently left trapped in the Quantum Realm.
Naturally there were some complication, but eventually the couple reunited and made it back to Earth.
In Ant-Man and the Wasp, Hank Pym, inspired by how Scott Lang was able to make it into the Quantum Realm and get back out in the first Ant-Man movie, ventured into this strange reality to rescue his wife, Janet van Dyne, who’d been trapped there for over 30 years.