If after the old man has done many bad things, it seems that the future generations are not going well, then should the future generations make more efforts to cultivate their minds and accumulate virtue first, so as to be good to themselves and the old people?
Yes! The old man will die in the new year, and many mistakes can't be made up. Only future generations can make up for it by their own efforts. Doing good and accumulating virtue is the best way.
Although the merits and demerits are not worth it, you can enjoy happiness only by doing good deeds, and you will be rewarded after suffering. Through suffering, you can also tell yourself not to do bad things again!