Answer:
Grandmother hypothesis
Step-by-step explanation:
The grandmother hypothesis is the result of a further developed mother hypothesis. The mother hypothesis suggests that the energy required to keep a woman fertile is better used in order to ensure that her offspring reproduce.
The grandmother hypothesis suggests that the grandmothers bolster the efforts of the mothers and make sure that their grandchildren's genetic interests are met. The grandmothers' can also increase the grandchild's social circle further increasing their chance to mate.