How to gain a trait if your father had another one?

[Elbadruhel]

Hello,

I want to create a trait that characters will get on birth if their father had another trait. The idea is to create a "family trait". I will explain it:
- Father is "Brave".
- Son gets trait "Brave Father".
- If this son becomes "Brave" too, his own son will get "Brave Family" on birth instead of "Brave Father".
- "Brave Family" is normal agnatic inherited trait so every future kid will get it.


Summarizing:

- Father has:
AND = {
trait = brave
NOR = {
trait = brave_father
trait = brave_family
}
}
Then kid gets: trait = brave_father

- Father has:
OR = {
trait = brave_family
AND = {
trait = brave_father
trait = brave
}
}
Then kid gets: trait = brave_family

Is it posible?