Does my half-brother, who is not and was never a US Citizen, have any rights to our deceased father's estate and assets? My father was and i am a US Citizen, both of us being residents of California, and the half-brother is from the Czech Republic.

My father's tiny will unfortunately only leaves the house to me, and neglects to mention anything else, so that is why things seem a bit "up for grabs".

Thank You!!!!!!!!
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Thank you for all the answers!!! I'm surprised i got so many.

I called the will is "tiny" because it only mentioned the home and no other things, in addition to being a strange combo of holographic and witnessed will.

Also, the reasons i am concerned about sharing with my half-brother are:
a.) i've only met him twice
b.) my father had only seen him twice in the last 15 years at least
c.) my father's will states that if i am not there to have the house, it does not go to my brother, but to my uncle; i think this says something about how my father felt about his son.
d.) if i do not have my father's assets, (mainly accounts), i am unable to pay the large mortgage, which will mean i loose the house my father wanted me to have. (I'm only 21 here...!)