if you leave a will, that’s correct. But if you don’t leave one that’s recognized, inheritance passes to the spouse and then the children equally. Frankly this is how my parents estate is, divided equally between the children once mom passes.
If you wish to save the family a basket full of legal problems and vast expenses, beg them to get a Living Trust done. A will must be probated which requires an attorney, time, and money. It can take a year or more to probate an estate, some times far more depending on the size of the estate. No one touches a cent until probate is finalized, the assets are frozen until probate is completed.
With a trust, the heirs get taken care of the day after the decedent passes, no questions asked.
UNLESS, you don't have an estate. My MIL just passed with nothing, no car no home, tiny bank account, not worth the states time to fool with for a small amount, they want the big stuff they can tax you on.
I don't know Washington laws, but in CA, without a trust you're begging for problems. It's worth investigating, it will save you a whole lot of grief. Do some research if mom and dad don't have a trust...