Bai Sui Kai Xitong, Xiaozi Xiansun Gui Man Shan!

Xiao Chen is a transmigrator who has lived a long, peaceful life and is now lying nearing death at the age of 100, when his System finally activated. Now he can earn rewards if his descendants have children. Not only will he get stronger, his lifespan will be extended, too! So go forth and procreate