Aw jeez, I had a response carefully typed out that I almost finished, and I had to go ahead and hit the wrong button. Bye-bye perfectly crafted response.
Anyway, samoht is the closest to what I meant - as long as
none of the heirs use a given skill certificate (let's say logic) for a career reward, all of the heirs can max logic, assuming none of the skill challenges are repeated as per the dynasty rules. This would not be possible with all skills due to the nature of the challenges and other considerations, but would be very doable with others, logic among them.
Before I turn this into a stream of consciousness essay and ramble on more than I have, it's about 12:30am where I am, and my brain is catching up to my eyelids as far as sleepiness goes. Goodnight moon...