Here we have another "new" household, founded by Simon's twin sister, River Tam (Family/Knowledge).
(Note: I realized after I named her that Charlotte shares a full name with a character in Lakeside Heights. Oops!)
(This baby is due before Simon and Meadow's first baby. River must have stolen her brother's fertility or something.)
Progress toward challenge:
New Sims: 2
Taxes collected: $1300/$58,970