I’m so sorry to hear about you brother. This is one of those occasions when your own priorities are way more important than somebody else’s holiday!
This is why HO’s need a back up plan. On this occasion, don’t start the sit, go and spend time with your family. The HO needs to find their own solution given the scenario.
We’ve never cancelled a sit… but this is the sort of scenario in which we would.
They are just going on holiday remember, so right now, you, your brother, and your family are more important.