If your grandfather made some animal sacrifices... which should be (re)performed by all the eldest sons... and some sons leave the traditions ...Is it possible to encounter problems that are family related and that pass on every generation..if they are not attended to?

Thus is karma transferrable? Or does this have nothing to do with karma?

<< If your grandfather made some animal sacrifices... which should be (re)performed by all the eldest sons... >>

who says "should be"? no.
Besides most hindus do nto/ did not perform anial sacrfices.

<< and some sons leave the traditions ...>>
oggd. it is better eace such tradition.

<< Is it possible to encounter problems that are family related and that pass on every generation..if they are not attended to? >>

not at all.

besides, one who surenders to krishna,
nas no ned to do any traditions othe than vaishnav tradition.

jai sri krishna! - madhav