I am pretty sure Dirk will totally fucking love Rose regardless of what he knows about her/them and they will totally have some verbose bro-outs (VERBROSITY). I imagine when he figures out there is a connection between him and Dave it won't be a stretch for him to realize she and Roxy have a connection, too. And while Rose can certainly stand on her own in his esteem Roxy is his FOREVER GIRL so obviously her progeny is gonna get the full Dirk Strider treatment (once he figures out how to invent the internet so he can go back to constantly stalking his loved ones from the cyber shadows).
Who knows, he may even end up asking for her advice on Dave, if Dave decides to be a problem child.
As for she and Dave being related--I don't think Dirk has a way of knowing that (Am I wrong??). :|a Buut if you mean in regards to incest specifically, Dirk will be the first person to tell them to fuck that heteronormative incest taboo bullshit and go for it. Being brother and sister is not a significant fact for him so if he does find out before them he wouldn't necessarily be prone to share if it would cause more harm than good.
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Who knows, he may even end up asking for her advice on Dave, if Dave decides to be a problem child.
As for she and Dave being related--I don't think Dirk has a way of knowing that (Am I wrong??). :|a Buut if you mean in regards to incest specifically, Dirk will be the first person to tell them to fuck that heteronormative incest taboo bullshit and go for it. Being brother and sister is not a significant fact for him so if he does find out before them he wouldn't necessarily be prone to share if it would cause more harm than good.
How are Rose's quadrants looking?