Indeed. Very bad luck for the daughter. But the fact that there was an assassination attempt on the father tells you that these folks mean business.
Putin has closed off any means of objecting to his war verbally. So here's what happens after that. The violence against Putin may be limited to a small group right now. But if it reflects a broader sense of unhappiness, well, there will be more of this sort of thing.
I wouldn't be so surprised to see a civil war in Russia, although as of now, it's probably less than a 10% chance.