Masha Allah aap ki Urdu tu bahout aala hai..
laikin Punjabi mein abhi thoarri se kamzori hai…
correct term is: tussi Khush kar ditta …
or better yet : tussi Khush Keeta
But if you meant it to be plural or more repectful, which I believe what you were thinking then it is:
tussan ne Khush kar ditta…
Khalik Khaan Sahib I must say it is a pleasure reading your perfect URDU..:k: