To combat this I am easing up on the restriction of using gallery sims for Legacy Challenge spouse material.
On the gallery, look up #Legacy Loves (name suggested by Boss Jinja) any and all families you find there can be brought into your world and become eligible spouses. Simply make one or more sims in CAS, then upload them to the gallery wiht the #Legacy Loves tag.
I don’t want people to be able to pick and choose what traits their spouses have.
Regardless of your succession law, you may always introduce children into your family via pregnancy or adoption.
You may rename the baby, and it is recommended (but not required) that you change their last name to the Legacy Family’s name.
If some games don’t run, make sure you have installed the latest version of Flash.
Finally the calculator will be used to generate the third trait upon reaching young adulthood.
There is an option here to generate both aspirations and all three traits for a sim at once, though the proper method is to wait until the Sim ages up. One of the hallmarks of this challenge is getting randomly generated children so you should keep the good with the bad.
Since the traits of the parents have an influence on the traits of their children, you can try to engineer children by selecting spouses with desirable traits, but this is no guarantee.
You are allowed to use fruit and/or music to influence the gender of an unborn child, should you choose to do so.