Dating a women with teenagers

So I'm bisexual and have been talking to this older. She has 2 teenagers, 15 and 16. I'm 19. Yes there's a huge age gap but honestly I'm done with women and men my age age. Both are on some bullshit 🙄. Well my sister doesn't think I should pursue this relationship because she has teenagers. I never had an issue with dating someone that has kids, but my sister said there is no way two teenagers are gonna take a 19 year old step mom seriously. Me and this women haven't been talking that long so if I cut my loses now it would really be a problem emotionally but I wanted a second opinion.