If the beneficial interest in a trust was funded by the Trustor out of separate property funds then the beneficial interest is separate property. Think about it, you are removing a piece of the land every time you sell a barrel of oil. It is well settled that a spouse has a community property interest to that portion of retirement benefits of the other spouse earned during marriage regardless of when the retirement account was opened. Generally, the community interest may be mathematically ascertained by apportioning the benefit between the months in the plan during the marriage and the total number of months necessary for accrual and maturity. The growth of livestock is separate property.
Offspring is community property.
This rule is derived from a classic case entitled Stringfellow v. Sorrells . Stringfellow was about mules. The mules grew. The mules became more valuable. Creditor tried to execute upon the increase in value.