Thanks for linking!
They are both adults; I don't use the mod but I do change sims' heights manually in their character file (so it's permanent). Marina is slightly short and Amanda slightly tall! I set them depending on parent's heights for born in-game sims, and by what height I think suits them for other sims. For example, my butler Babbage just seemed tall to me- and Jeeves was crying out to be tiny. And Will Wright in sim form just needed to be short, even though I think he's tall in real life. I get a lot of amusement from the graphical glitches involved with the differing heights; watching tall sims navigate spiral stairs is hilarious!

LOL, graphical glitches are the reason all my sims are the same height.

Sounds interesting. Where did you find a mod that lets you have teenage nannies? (Assuming it's a mod.)

I do have a teenage nanny in my game, but he's a playable who lives in with the family. Antonio Monty actually offered to adopt him, but Berjes Wilsonoff decided he'd rather stay a Wilsonoff than become a Monty.

On the other topic, I too have the problem of Sims trying to kiss each other but missing, but in my case it's because I have teens in love with adults.

The only mod I know of that does this is LD's Playable Nannies. Unfortunately, even though it's not mentioned in-text, I see on the bottom of the page that it requires AL/M&G.