After some testing and searching around different forums, i think i find the way to maintain a pure bloodline. (ie. no adoption, no marriage to female family member, no man of hour event)
First of all let me explain the mechanic of the family tree system.
There is a hidden ration between number of family members to province, if the ratio of that is way too low, the game will try to balance up this ratio by pumping up the number of family members, in this order:
Adoption -> Marriage among female member ->Marriage among male member
Since marriage among male member cant instantly increase the family size, it get the least priority. ** And this means, as long as you have a unmarried female members, you will NEVER get any marriage proposal for your male members.
I believe many of us did make the same mistake to reject all marriage proposal for husband in order to keep the true bloodline, but ironically this just prevent the male members to get marry and produce children.
Therefore, the way to avoid this is accept all husband proposal and get him killed in battle. (ie. eliminating the female members in the family tree)
Or, you can mod the game which female member will "retire" in a single turn. (mature at age 16, retire at age 17)![]()
ps. Never expand your kingdom too fast or you will only get adoption offers instead of marriage offer. Once you get adoption offer you have to stop expanding your land but expanding your family tree first.![]()
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