In the prologue, you should have an event if you had an affair with a minor noblewoman, resulting in a bastard son. This would make your succession much more interesting.
The bastard son wouldn't be central to the storyline if you choose to ignore him; he would live with his mother. However, if you decide to involve him in politics, you could choose to legitimize him But it is not necessary
He would be like Lucian, engaging in his own schemes and intrigues, but he wouldn't plot against you if you manage the situation wisely.
This event would enhance the gameplay by introducing new strategic options. You could arrange marriages to create alliances, such as marrying him to the daughter of Smolak for Zille and securing a marriage with Vina to Pales.
If you wish to make him your heir, Rumburg might oppose this, but you could counter by arranging another strategic marriage, like Beatrice's daughter marrying your son, thus renewing the alliance. Legitimizing him wouldn't be necessary for these alliances it is only necessary for rumburg.
Also vina and he would have cold relationship. Not hatred but not happy relationship either
: "Whoops"
just wear a condom, Romus.