Usually I let them sort the duchies out themselves (if wars are allowed between vassals). The only time it's worth consolidating realms like that is if you need to create one so your ruler can have the title or give it away

LP1 by FKA Twigs

I remember when some of my friends bullied another into getting a 56k modem so he wouldn't slow down their Starcraft games

This is what convinced me that Dazzler was a comic book character people knew about

Yikes, I wouldn't want to be the parent who had to take their kid home from Bambi early

Mine was similar, but for a midnight release of Star Wars Episode II. The film tore and we had to wait for the projector operator to fix and respool it

If they're allied with both of you, they should usually stay out of it. It might not work if the person you're attacking has a captive or married a closer family member.

Got to import some spouses with good traits

Only on an inner tube full of grave dirt

A lot of those machines were still hand-cranked and had a bunch of variance, so they would have ways of adjusting the playback speed