儿孙自有儿孙福er sun zi you er sun fu

every one of your sons and your grandsons must find his own way as he ought to

儿孙自有儿孙福

the children will have their own happiness and fortune;the children can take care of themselves when they grow up
～，莫为儿孙作马牛。As your children will strive for their own happiness and fortune when they grow up,don’t serve and worry for them all your life.