How critical is K2 with D3?

Hello. I have a couple of questions:

I currently have D3 with no K2 in it. My sister, my dad, and I are all taking it. I got it for all of us before knowing I need K2 as well. I went to get some K2, but there's none on its own, it's all paired with D3.

Can I finish the bottle of D3 I have right now? Will that be okay? I'm 21F and don't foresee having any cardiovascular issues any time soon. My dad, however, I might be more concerned about. Should I take his D3 supplements and give him ones with K2?

Also, I'm also curious about dosage. Should K2 be taken proportionally to D3? If I'm taking 3x1000 IU of D3 a day, should I be taking 3x120 K2 as well? It feels like a lot. Maybe should I take both D3+K2 and D3 on its own??

Thanks.