"उनका रिश्ता अच्छा है।"

Translation: Their relationship is good.

[shukladhaivat17]

Can Their relation is strong. be accepted??

[zeebo7]

I would say no. A relationship could be good, but not strong (you don't see someone very often, e.g.).

[Norman570214]

yes, and I said that their relationship is fine, but of course it was marked incorrect.

[Marissa321702]

Why can't it be his/her?

[Wilbur111]

Thah would be uska not unka.

I remember the "s" in "his" to remember the "s" in "uska".

And ure the "m" in "them" to correlate with the "n" in "unka".