Grandpa wasn't an ape
Contrary to popular belief it is a misnomer that evolution claims that we are descendant from apes.
It in fact does not claim that- we actually have a common ancestor which is not at all the same as to say we are descendant from them.
The ancestor is believed to be from the Miocene Epoch (7 million years ago).
Either Sahelanthropus tchadensis, Orrorin or possibly Ardipithecus