That sucks. You'd think there would be enough characters that some arcs they could double up.
The Freemans (originally planned seperate, now combined, but still roughly 10 events, not 10 each)
The Linnets (again as above)
Sam and Bex (again as above)
All started as seperate and the Devs decided to merge them as they found a compelling story to tell.
Sophia and Sifa have very seperate arcs at the moment. (Pregnancy stuff with Sophia, and Sifa finding her voice through her art) That they get an update each.
Combining means the number of events are shared, as the Dev Team don't want to combine and have the production of an update take longer and longer due to that