You need to be more specific...what type of game (RPGMAKER, Ren'Py, Unity...), what else are you looking for (like shota, and shit).
Some Ren'Py games that are 2D and have mother and son relationships: Summertime saga, snow daze, insexual awakening, amity park, business of loving (download incest version)...
RPGM: Urban Demons, Never saint, zombie retreat, zombie life, town of passion, bones tales...
there's other games but can't think off the top of my mind.