You should try MCCC by deaderpool. Weerbesu's UI (download listed above) works just fine and can be used in conjunction with MCCC.
MCCC allows you to do a lot of things, and can help you cull your folder.
Start pregnancies, random pregnancies, have your townies get married randomly, all kinds of stuff.
https://deaderpool-mccc.com/#Top
read the documentation to help you understand all the cool stuff you can do.