Out of topic question.. But I am way deep into giving up

1+2. Josh invited Chase to meet his mother and sister. Let' say especially his sister was shocked when she saw who was infront of their door, his mom was fine with it.

3. Yes. 3rd child, last chapter of the main story of Kiss me liar he told Yeonwoo he was pregnant ( novel onyl). The daughter was mentioned later, but not name.

But Diana?O_O Where did you read that? Because I would be kind of surprised if this is her name, since the author used the name "Diana" in a different context
(would be a spoiler and something you would never guess).
So I really would like to know you got that from.

4. In the sidestories, didn't you read them https://novellist.net/novel/kiss-me-if-you-can-novel/
In the extras of Kiss me liar, him, Cecil and Spence are shown together several times. Some adapted to manhwa, some where not ( like visting Josh/ first meeting with Cecil and Yeonwoo's babyshower).
The Millers are not a normal family, to explain that would take some time. And Chase struggled with that the most I think, doesn't mean that the other didn't have any problems.
It took years for Chase to have contact with them again. So I don't think they met their grandparents.

Thank you so much for answing my inquries, and even corrected me with some facts.

did not read the kiss me liar novel. only this one.

thank you so much with another site for novel reading too.. I owe you.

I still want to know where you read the name "Diana"? ^^

from reading the spoilers guven by people here or the one posted in novel updates.. note sure which one though