[SoftTalker]

You'd probably need to create a religion for them about some gods/ancients that they are serving in their mission. That seems to be how humans stay focused on long-term social organization across generations.

[gomoboo]

See the Mormon generation ship in The Expanse: https://expanse.fandom.com/wiki/Nauvoo_(Books)

They were intending to use the ship to get to the Tau Ceti system: https://exoplanets.nasa.gov/exoplanet-catalog/7179/tau-ceti-...

Mormonism seems well-suited for the religion role you mention since they have the concept of a particular planet being close to the residence of their god: https://en.m.wikipedia.org/wiki/Kolob

[konart]

Or modify them genetically making them biological robots. Or create artificial humanoids similar to Abh: https://seikai.fandom.com/wiki/Abh

[int_19h]

https://en.wikipedia.org/wiki/Orphans_of_the_Sky