I think when you are referring to family members you don't use the article. But I could be wrong!
You are right!
I see - thank you both for this
Sounds like one of the rubbish pick-up lines from flirting....
In other examples, duolingo insists on articles for family members. Weird...
You may know by now, but singular family members don't need articles while plural ones do.
Mio fratello.
I miei fratelli.
This is still useful, thank you