Cross Your Fingers!
Everyone should know a lawyer. And a mechanic. Wouldn't hurt to have a plumber in the family either.
Each generation should have a family ceremony where the newest parents pull occupations out of Tupperware and promise to produce a doctor, dentist, electrician, whatever requirement their children won in the lottery.
"You know my sister is going to get the oncologist and our little Jenny is going to be an exterminator."
"At least now I know why your Cousin Bob is the way he is. Your parents generation went all hippie and put things like 'moonshiner' and 'mime' and 'medicinal gardener' in the mix."
Arranged marriages are so passe. Arranged careers, now there's the way to control your children's lives to your benefit.