Is it permissible to live in an apartment built by one's father through deceit and bribery to avoid its demolition? And is it permissible to pay another bribe to get electricity connected to this apartment, or to build other additional floors legally?

Bribery is a major sin (kabirah) and is forbidden if it is for nullifying a right or establishing a falsehood. This prohibition includes the one who offers the bribe, the one who accepts it, and the intermediary. However, bribery given to obtain a right or ward off injustice is permissible according to the majority of scholars, and the sin falls upon the one who accepts it.

Regarding the extra floor, if your father had a legitimate right to add it and could only do so through bribery, then his action is permissible, and you may live in it. However, if he did not have such a right, then his action is forbidden bribery, and he must repent and rectify the situation. This applies to electricity and future floors as well.

If what you asked about is not permissible, then you must prevent your siblings from it to the best of your ability.