Immortality: Start by Acquiring Dual Cultivation Techniques

The harem is well received. But Chen San, the grandfather, is completely redundant. An ordinary person has no effect on the protagonist, and he has to eat and live with the protagonist and the heroine. It would be fine if this was a eunuch novel without a female protagonist. This is a harem novel. It is equivalent to the protagonist keeping a male partner in his harem, which is very poisonous. Moreover, you are still a mortal. Will the protagonist have to invest all resources to cultivate immortality and immortality with this "grandpa"? Who can read novels nowadays and still regard the protagonist's grandfather as his real grandfather, no matter how much he takes care of him and how much he invests in him, he should take it for granted?