The 'Mr. and Mrs. Smith' showrunner enlisted her father-in-law, who happens to be Ron Perlman, to play a 'baby man' on the show

"Mr. and Mrs. Smith" features a memorable guest appearance from Ron Perlman, who happens to be showrunner Francesca Sloane's father-in-law.

https://www.businessinsider.com/mr-and-mrs-smith-ron-perlman-episode-father-in-law-2024-2