It depends on where you live. Some states require disclosure -- others do not. (There are probably many more deaths in homes than anyone ever know about.) If the death in the home was or was not a brutal event -- the neighbors would surely tell the new owners anyways.
It’s not uncommon for multiple siblings to own a property, usually because they inherited a childhood home or vacation house when their parents passed away. Joint ownership has several benefits, especially if each sibling wants to keep the home in the family’s possession.
However, there are some additional financial and legal consideration