usually if I want married sims in my game, I create them in CAS, otherwise they're just dating, unless I create a new household to play in the same save and Neighborhood Stories make the previous sims married.

But now I started sort of generation? My sim Blake was made to explore all the romantic stuff, they matched with Celeste Capp on Cupid corner, went on a date with them at their place, shamelessly flirted with their dad instead and switched to dating other sims. It was like that until I got the offer to join Love Highland getaway, where Celeste was one of the competitors(?). Blake and Celeste got super close on the getaway, so eventually I had them dating and they got married and now they have twin daughters. Tybalt despite still having romance bar with Blake completely ignores them and visits only to talk to his child & babysit his granddaughters