Who is Obed's Cousin from The No. 1 Ladies' Detective Agency and what is their importance?

Obed's unnamed cousin moves in with him and the young Precious following the early death of Obed's wife. She is treated with respect by Obed and with affection by Precious, who is grateful to her for both her unconditional support, her warmth, and her teachings, all of which, it seems, contribute to the shaping of Mma Ramotswe's desire and in the direction of her eventual career.