CA AB1628

Permits grandparents to petition for visitation rights with grandchildren if a preexisting relationship exists that engendered a bond and visitation is in the child's best interest, balanced against parental authority.

Adds incarceration or involuntary institutionalization of one parent as a new circumstance allowing grandparents to file for visitation while parents are married, joining existing circumstances like parental separation or absence.

Establishes rebuttable presumptions that grandparent visitation is not in the child's best interest if both parents agree to deny it, or if the custodial parent objects.

Allows courts to allocate grandparental visitation percentages for child support calculations and order parents or grandparents to pay support costs including transportation, medical expenses, and childcare.

Requires grandparents to provide notice of visitation petitions to parents, stepparents, and custodians by personal service, and prohibits visitation if it conflicts with the rights of a birth parent not party to the proceeding.