What does it mean when a girl jokes and talks about getting married with you?

AN1995
I've known her half of my life so far. And she always jokes about having kids. And a house and getting married to me.

what does this mean from a girl’s perspective?

we aren't boyfriend and girlfriend yet. But know eachother quite well. And theirs an obvious attraction between us.

i want to ask her on a date but am quite unsure how...

her parrents get along with my family very well, They always invite me over for dinner. and to hang out.

and this girl is also very close with my sister.

we bolth are 24 If that helps
What does it mean when a girl jokes and talks about getting married with you?
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