Section 6454 Of Chapter 2. Parent And Child Relationship From California Probate Code >> Division 6. >> Part 2. >> Chapter 2.

. For the purpose of determining intestate succession by a person or the person's issue from or through a foster parent or stepparent, the relationship of parent and child exists between that person and the person's foster parent or stepparent if both of the following requirements are satisfied:
  (a) The relationship began during the person's minority and continued throughout the joint lifetimes of the person and the person' s foster parent or stepparent.
  (b) It is established by clear and convincing evidence that the foster parent or stepparent would have adopted the person but for a legal barrier.