CA would have jurisdiction under the UCCJEA (the federal jurisdictional child custody at) unless all parties move out of the home state, in which case the new state could assume jurisdiction.
If the grandfather had custody, then generally the other spouse would be treated as a step parent. A step parent has standing to sue if the child resided with that person 90 days prior to the filing of the suit:
Sec. 102.003. GENERAL STANDING TO FILE SUIT. (a) An original suit may be filed at any time by:
(1) a parent of the child;
(2) the child through a representative authorized by the court;
(3) a custodian or person having the right of visitation with or access to the child appointed by an order of a court of another state or country;
(4) a guardian of the person or of the estate of the child;
(5) a governmental entity;
(6) the Department of Family and Protective Services;
(7) a licensed child placing agency;
(8) a man alleging himself to be the father of a child filing in accordance with Chapter 160, subject to the limitations of that chapter, but not otherwise;
(9) a person, other than a foster parent, who has had actual care, control, and possession of the child for at least six months ending not more than 90 days preceding the date of the filing of the petition;
(10) a person designated as the managing conservator in a revoked or unrevoked affidavit of relinquishment under Chapter 161 or to whom consent to adoption has been given in writing under Chapter 162;
(11) a person with whom the child and the child's guardian, managing conservator, or parent have resided for at least six months ending not more than 90 days preceding the date of the filing of the petition if the child's guardian, managing conservator, or parent is deceased at the time of the filing of the petition;
(12) a person who is the foster parent of a child placed by the Department of Family and Protective Services in the person's home for at least 12 months ending not more than 90 days preceding the date of the filing of the petition;
(13) a person who is a relative of the child within the third degree by consanguinity, as determined by Chapter 573, Government Code, if the child's parents are deceased at the time of the filing of the petition; or
(14) a person who has been named as a prospective adoptive parent of a child by a pregnant woman or the parent of the child, in a verified written statement to confer standing executed under Section(###) ###-####/a>, regardless of whether the child has been born.
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