How to look after a 16byear old and 7 year old?

There was an emergency this morning. Russia re captured Soledar, in the Donbas region of Ukraine. my grandparents znd other family members live there. I knew my brother was going out to help as he is a doctor and then I was meant to go out in a few weeks.

However, I get a knock on my door with brother, my parents wnd my neice saying that they (my brother and my parents) will be leaving for Ukraine at this moment. My neice (my brothers child) is 7 and he girlfriend are separated I guess. Anyways her mother is somewhere in Europe rn and my brother has left the country.

My younger sister, is 16 and can look after herself but I'll keep an eye on her. I've got an older sister as well but she isn't in the country as she is studying abroad. There is no one else in the part of the UK we live in that can keep and eye on them. So yeah I'm here now 🤔

I have no clue what currently happening. I'm tempted to go back to my parents house and stay there with my neice and younger sister. My sister lives there obviously and my neice has her own room there. Plus my flat/apartment is too small so it makes more sense. They don't know I've dropped put of university but they just said "you'll figure it out round your schedule?" 😐

Do um yeah, not sure what to do rn. They are currently in school so I have a few hours to figure it out. I've baby sat them before for a night and a few weeks but I don't know how long this will last. Am I their legal guardian now? Help please, I have literally no idea what to do rn 😮‍💨
How to look after a 16byear old and 7 year old?
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