Scott, 30, who lost his mother earlier this year after a brief illness, has changed by the loss, reported Contactmusic.
"Scott's been more emotional since his mom died. He's now more dependent on Kourtney. It really affected him. He's staying at home more and being a much better father. Scott has grown up a lot. He's much more responsible," a source said.
The tragedy has brought Kourtney closer to Scott, with whom she has two children, Mason and Penelope.
"Kourtney has been saying she wants to grow old with him. Their connection is stronger now than it has ever been," the source said.