The most secure way to keep up the structural integrety of your demesne while keeping your potential heirs-to-be alive in a gavelkind environment is to expand like hell and land your surplus of sons adequately (although that might take huge efforts every generation and results in your realmn almost never being at peace - what is bad for the most non-Norse realms)
Edit: a downside not to be overlooked is thatyou have to land your sons probably much earlier than you would have liked, just to be sure, for it takes some time to accumulate the needed holdings to balance against your main title. That way, you most surely will lose the influence on your second /third, fourth...) son's education, for he would be on his own once he left your court to become the Jarl of some newly conquered piece of land somewhere far off. Positively you can say that it raises your dynasties prestige, for as you continue to go on, your kinfolk is getting their hands on more and more land with every generation passing.
Edit: a downside not to be overlooked is thatyou have to land your sons probably much earlier than you would have liked, just to be sure, for it takes some time to accumulate the needed holdings to balance against your main title. That way, you most surely will lose the influence on your second /third, fourth...) son's education, for he would be on his own once he left your court to become the Jarl of some newly conquered piece of land somewhere far off. Positively you can say that it raises your dynasties prestige, for as you continue to go on, your kinfolk is getting their hands on more and more land with every generation passing.
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