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If the heir is between 15 and 18 years old, you can enact the "Introduce Heir" cultural decision, this will give you a modifier that raises the heir's legitimacy for a few years (I forget the exact numbers).
If the heir is between 15 and 18 years old, you can enact the "Introduce Heir" cultural decision, this will give you a modifier that raises the heir's legitimacy for a few years (I forget the exact numbers).
It's technically possible (i.e. a mechanism for that exists, but is not used by any event) but as far as I know only events that decrase heir's claim exist in the game and I only know of 2 of them (but it should be possible to mod some that increase it).