How does Potokwane convince Maketoni to adopt two orphans as a wedding present?

Mma Potokwane tells him she drove by the house on Zebra Street to see where he would be living. She says the house is large enough for children, but he says that they will be very happy without children. Mma Potokwane tells him they could always adopt some of the orphans. The orphans could live with them without the formality of adoption. She suggests two orphans as a wedding gift to Mma Ramotswe.