In Family Guy, the mother Lois Griffin comes from the wealthy Pewterschmidt family. The Griffins have a dog named Brian who speaks perfect English, enjoys a good martini and is well-read. Despite all this, Brian is just a pet.
Pets are certainly family members, but they do not have inheritance rights. If you pass away without a will, there are no provisions to deal with who will take care of your pet. Assets are not set aside to pay for the cost of a pet unless your will so dictates. If you want to provide for your pet, you can include provisions in your will or trust, or create an actual “pet trust”.
Also on the show, Baby Stewie is fixated on the death and destruction of his mother, Lois, but she manages to foil all of his attempts. In most states, including Oklahoma, the Slayer Statute prevents you from inheriting if you are the same person who caused the death (or, most recently, if you exploited the decedent during their lifetime).
Remember Lois’s parents? They don’t care for her husband Peter. If Lois’s parents set up a trust for her benefit, she can receive income and principal during her lifetime, but upon her death, Peter does not inherit.