Is it okay to expect advisors to offer a word of condolence?
Expressions of emotional concern are a tricky balance for supervisors to find sometimes, and can also have a strong cultural or religious component to it. For example, some faiths have suggested that mourning should be confined to a very particular interval and not extend past that. (I’m aware of this in certain Muslim and Jewish denominations, for instance).

Also, the response of an individual to reminders of grief can be intense and unexpected, and advisors may not want to put you under any additional pressure or stress or cause an episode while you’re meeting that they can’t or don’t feel comfortable handling.

So it just might be that they don’t want to cross any boundaries that feel inappropriate. 

All of that said, there does remain a finite possibility that they may view their advisees as labor input rather than complex human beings. Such advisors sadly do exist and are not particularly enjoyable to work for. 

If it’s an important enough issue that you feel that it’s making you less interested in your work or the relationship with your advisors, you may want to consider having a discussion with them at the end of a meeting to discuss it.