Twins are doing well, dad says.

DENNIS QUAID says his traumatic hospital scare has a happy ending -- four-month old twins THOMAS BOONE and ZOE GRACE are now healthy and thriving.

"Their progress and their development appears to be completely normal -- aside from being a Quaid," he jokingly told People.

"It's the greatest thing to hold those kids and see their faces because we had a happy ending," he added. "It's great to be a normal dad with the normal problems of not having enough hands for both of them."