Cheat to Alter Milestones?

Does anybody know if there's a cheat code to add/remove/alter milestones? It really bothers me that there are different milestones for having vs. adopting a child, but the premade families with adoption backstories (the Michaelsons, the Greenburgs, etc.) all have the "had a baby" milestones instead of the "adopted so-and-so" milestones. I'd like to change these, but haven't found any info online yet about how to change an existing milestone. Thanks!