Spencer and Erica Shemwell are taking a big step towards blending their families — but not everyone is happy about the decision that's being made.

On Tuesday's episode of The Blended Bunch, the couple surprises their combined 11 children with the news that Erica and Spencer will be legally adopting each other's sons and daughters. While the process won't feel like much of a change for Spencer's four children, Erica's seven kids face a bigger adjustment: taking on their stepfather's last name.