"Your lady should be careful, as well."
I mean, it's one of the more creative ways to commit suic*de, I suppose?
Yak/Triad/Tong in manga always making the mistake of involving family; which, in the words of Chuck Mansell, "... you know you DON'T FUCKING DO."
Going after somebody's family is a sure-fire way to create a dedicated, uncompromising, pityless and implacable enemy; one who almost certainly will seek to take your life from you in some way.
Threatening the first person with whom they have loved, and been loved in return?
I mean, that's a bad plan; not tough, not smart, certainly not business-savvy.
Making a physical threat on a royal family member and his intended is a really great way to ensure defeat in detail.
Dumb. Fuckin. Move, Triad-Tong Boi.