Dinner for Family in Merced
I think I mentioned this when you posted previously about Merced, but while there aren't a whole lot of options if you want a private room, Fernando's Bistro on Main does have a nice private room. It does a fair amount of business so probably best to book early. That said, the last time I ate at Fernando's the food wasn't particularly good.
D'Angelos had a private room at their old (Main St) location, and the food there is good. You might call to see if their new location on Child's has a private dining room.
510 W Main St, Merced, CA 95340