Do you believe that behaviours could be inherited?

About half of our natural inclinations are genetically inherited, according to the most recent research into that. You can find a little bit of information about that if you drill into it on the internet.

They can be, my sister has a lot of behaviours inherited through dad where mine are inherited through my mum.

Yes. Inherited behaviour is a thing.
Some of our behaviour can be ruled by our genetics which we inherit.

Yes, but I also believe that they can be overcome in most cases

Yes, if trauma can be (documented) then other parts can be.

Yes, many are. But some are environmental.