What size well pump is suggested for a single home with one bath and washer for a family of four?

Anything from a half horse to a three quarter horse.
Good luck, Tom

Harold07,
There are several factors to consider when sizing a water pump - define the peak demand flow rate, determine the well depth, capacity, recovery rate, static water level, and, are there any water chemistry or condition issues?
You might also want to consider using a constant pressure pump; ECM technology allows these variable speed pumps to deliver constant velocity based on flow rates. These pumps can operate with less electricity while delivering continuous pressure, and, they operate without a large storage tank...

Speedball is about right unless you are talking about an unusually deep well.