Hi, you can try these ones :
- Lewd island
- Parental love
- Daughter sagas
- Daughter for dessert
- Dating my daughter
- Young again
and I think you can try these too but i haven't tried them yet :
- Forever my girl
- I love daddy
I've not played all of these, but I'm pretty sure that none of them have scenes with a daughter/granddaughter. Parental Love ends with the MC having multiple children with his daughters, but these are only mentioned to exist. For the other's, I'm not even sure whether daughter/granddaughters exist, not to speak of getting fucked.
Maou-Sama has multi-generational incest, although it can be a bit difficult to follow along as to who is related to whom how.
23 Sisters has the MC knocking up his sisters, and fucking the resulting offspring. I'm not quite sure whether any of the offspring is pregnant yet, but the MC hasn't fucked any granddaughters yet. But I'm sure we'll get there.