Man, two wives reach an agreement: Three days of week with one, next three with the other

A 28 year old man and the two women he married and fathered children with — neither knew of the other — have arrived at an unusual agreement that will allow the menage a trois to continue: he will divide his assets and time between the two families, spending the first three days of the week with one wife, the next three days with another, and have Sunday to himself