Seeing, according to the Cambridge dictionary:
considering or accepting the fact that; as:
Seeing we're the same size, we often wear each others' clothes.
I'll make this recipe again, seeing that you like it so much.
We may as well go to the concert, seeing as we've already paid for the tickets.
Seeing as how I'm broke, I'm not coming out tonight.
Fewer examples:
I'm not optimistic, seeing that he dismissed my suggestion so casually.
I thought he was a bit rude, seeing as we'd never met.
Seeing as how you enjoyed my last story, I thought I'd send another.
Seeing, according to the Cambridge dictionary:
considering or accepting the fact that; as:
Seeing we're the same size, we often wear each others' clothes.
I'll make this recipe again, seeing that you like it so much.
We may as well go to the concert, seeing as we've already paid for the tickets.
Seeing as how I'm broke, I'm not coming out tonight.
Fewer examples:
I'm not optimistic, seeing that he dismissed my suggestion so casually.
I thought he was a bit rude, seeing as we'd never met.
Seeing as how you enjoyed my last story, I thought I'd send another.