Russell Wilson Is the Biggest Kid at Disneyland ... Screams Prove It

Ciara and Russell Wilson took Baby Future to Disneyland, but it looked -- and sounded -- like Russell was the one really enjoying it.

There is no doubt the Seahawks QB is ALL IN for the stepdad life after seeing this video -- he proudly walked around in a Mickey Mouse "Fantasia" hat ... and you gotta see his reaction to a roller coaster in California Adventure park.

The newly engaged couple and the little one look like the perfect family -- which they'd kinda have to be to brave Disneyland crowds on a holiday weekend!